The Wanda Beach Murders: Part Two – The Hunt for the Killer

In Part One, we followed fifteen-year-old friends Marianne Schmidt and Christine Sharrock on what should have been an ordinary summer day at Cronulla Beach—a day that ended in one of Australia's most infamous unsolved murders.

Now, the investigation begins.

From the mysterious teenager known only as "The Surfy" to convicted murderer Alan Bassett, serial killer Christopher Wilder, and Australia's notorious Derek Percy, detectives pursued every promising lead in their search for justice.

We explore the suspects, the missed opportunities, advances in DNA technology, and why, more than sixty years later, the Wanda Beach murders continue to haunt Australian criminal history.

Will this mystery ever be solved?

Join The Eclectic as we conclude our two-part investigation into one of Australia's greatest unsolved cases.

Transcript

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Welcome to the eclectic. Some cases do not resolve into answers, they accumulate detail instead. And in doing so, they leave behind something heavier than explanation. This is one of those cases. In January of 1965, fifteen-year-old friends Marianne Schmidt and Christine Sharrock boarded a train bound for Cronula. It was the height of the Australian summer, and like countless teenagers before them, they were simply looking forward to a day at the beach. They never came home. Their disappearance led police to the isolated Wonder Sand Hills where less than twenty four hours later, the girls were found murdered. The brutality of the crime shocked Australia. What followed was one of the largest homicide investigations the country had ever seen. Thousands of witnesses were interviewed, hundreds of detectives were assigned to the case, the vast sand hills were searched metre by meter, and the public became fixated on one mysterious figure. The unidentified teenager known only as the Surfee, the last person believed to have seen Marianne and Christine alive. But despite an investigation stretching across thousands of pages, no arrests were made, no murder weapon was recovered, and the identity of the killer remained a mystery. For many investigations, that's where the story ends. For Wonder Beach, it was only the beginning, because over the decades that followed, detectives would revisit the case time and time again. New suspects would emerge, new theories would divide investigators, advances in forensic science would offer fresh hope. Yet every promising lead seemed to end the same way, with more questions than answers. This is part two of the Wonder Beach Murders. This is the hunt for a killer. The first of the suspects belonged to a quiet young man from Wannagong, a man whose own crime shocked Australia. His name was Alan Bassett. Alan Bassett did not become a suspect because of the Wonder Beach investigations itself. Instead, his name surfaced after another young woman was murdered. On the evening of Friday, june tenth, nineteen sixty six, twenty year old Carolyn May Orphan attended a dance in Wallagong. During the evening she met twenty one year old Alan Bassett, a quiet fitter and turner from the nearby suburb of Ornandera. When the dance ended, Carolyn accepted Bassett's offer of a lift home. She never arrived. Instead, Bassett drove her to an isolated location where he tied her up, strangled her, and repeatedly struck her over the head with a large rock before leaving her body beside the road. The brutality of the attack shocked investigators. Bassett was quickly identified and arrested, and while the evidence against him was overwhelming, his own explanation was baffling. He claimed he didn't know what had come over him. He insisted he had never intended to kill Caroline, and pleaded to be found guilty of manslaughter rather than murder. For many, it was an impossible argument to accept. The violence inflicted upon Caroline suggested a sustained and deliberate attack, not a momentary loss of control. Although Caroline's murder differed in several important respects from the killings of Marianne Schmidt and Christine Sharok, investigators couldn't ignore certain similarities. There was the sheer ferocity of the violence, there was the apparently motiveless nature of the attack, and there was the geography. Unandera lay only minutes from the Piccadilly shopping arcade, where Williamina Kruger had been murdered earlier that year, and less than an hour's drive from both Wonder Beach and Menai, where Anna Dowling Cower's body had been found. It was enough for some detectives to begin asking whether they were looking at a man responsible for far more than a single murder. Further inquiries appeared to strengthen those suspicions. Investigators established that Bassett had been in the Cornula area around the time Marianne and Christine were killed. It wasn't proof, but it was another piece of circumstantial evidence that refused to go away. One detective in particular became convinced he had found his man. His name was Sess Johnson. Johnson had worked on the Wonder Beach investigation and, over time, had become increasingly certain that Alan Bassett was responsible not only for Carolyn Orphans' murder, but also for the deaths of Marianne Schmidt, Christine Sharrack, Willowina Kruger, and Anna Dowling Cower. It became more than a working theory, it became an obsession. After Bassett's conviction, he was diagnosed with schizophrenia and transferred to the Morissette Psychiatric Hospital near Newcastle. Rather than letting the case go, Johnson visited him regularly. The detective hoped that persistence would eventually produce a confession. It never did. During one visit, Bassett presented Johnson with a painting he had completed while in hospital. At first, the detective paid little attention to it, it was simply another piece of artwork produced by a patient. But some time later, Johnson studied the painting more closely and became convinced it depicted the Wonder Beach crime scene. More importantly, he believed it contained a detail that only the killer could have known. What that supposed detail was has never been publicly revealed. Without knowing exactly what Johnson believed he had identified, it is impossible to independently assess the claim. Nevertheless, the painting only strengthened his conviction that Bassett was the man they had been searching for. Johnson eventually took this theory to the public. He spoke openly about his belief that Bassett was responsible for the Wonder Beach murders and even began writing a book outlining his conclusions. Not everyone shared his confidence. Many of his colleagues privately believed he had become too emotionally invested in the theory. After years spent chasing an unidentifiable killer, they felt Johnson had begun interpreting ordinary events as confirmation of what he already believed. In other words, they feared confirmation bias had replaced objective investigation. Before Johnson could complete his book, he was killed in an accident. With his death, many of the details underpinning his theory died with him. One person Johnson did persuade, however, was Alan Bassett's own father. In an extraordinary public statement, Bassett's father said he believed his son was responsible for the Wonder Beach murders, and argued that he should never be released from custody. It was a remarkable position for any parent to take. Yet belief, however sincere, is not evidence. Alan Bassett consistently denied any involvement in the Wonder Beach murders. He admitted responsibility only for the murder of Carolyn Orpham. In nineteen ninety five, after almost three decades in psychiatric detention, Bassett was released back into the community. Five years later, he publicly offered to provide a DNA sample in an effort to eliminate himself from the Wonder Beach investigation once and for all. Whether the police accepted that offer has never been publicly confirmed. To this day, there is no forensic evidence linking Alan Bassett to the murders of Marianne and Christine. His proximity, the nature of his own crime, and Detective Johnson's unwavering belief continue to make him one of the most frequently discussed suspects. But suspicion alone has never been enough to solve the case. As the years passed, investigators continued to revisit the Wonder Beach murders whenever a violent offender emerged whose background appeared even remotely to fit the case. Most were eliminated quickly. A handful, however, remained subjects of debate. One of those men was Christopher Wilder. Unlike Alan Bassett, Wilder was never linked to the investigation because of a confession, a witness statement, or physical evidence. Instead, his name surfaced because of the man he would eventually become. In 1984, Wilder dominated headlines around the world after embarking on a series of murders across the United States. By then, he had become known as the Beauty Queen Killer, targeting young women by posing as a fashion photographer or a modelling scout. Following his death that same year, detectives in New South Wales began asking an obvious question. Could Christopher Wilder have started killing long before anyone realised? The possibility was worth exploring. Wilder had been born in Sydney in nineteen forty five, making him nineteen years old when Marianne and Christine were murdered. He was living in New South Wales at the time. Physically, he also bore similarities to the description provided years earlier by Wolfgang Schmidt. None of those facts proved anything, but they were enough to justify another look. Investigators also examined Wilder's earlier criminal history. Long before the murders that made him internationally notorious, he had already come to the police attention for sexual offences. Those incidents demonstrated a willingness to target young women and use deception to isolate them. For detectives reviewing the Wonder Beach investigation, that pattern was impossible to ignore. What troubled investigators most was not any single offense. It was the consistency. Again and again Wilder appeared to seek out vulnerable young women, often approaching them under an apparently harmless pretext before attempting to gain their trust. It was behavior that echoed one of the enduring questions surrounding Wonder Beach. How had Marianne and Christine been persuaded to walk deeper into the sandhills? There were no signs that either girl had been forced there in front of witnesses. If the killer was a stranger, he had somehow managed to convince them to accompany him voluntarily. That possibility naturally caused detectives to look closely at offenders known for manipulation rather than outright abduction. As Wilder's background came under greater scrutiny, another detail emerged. In nineteen sixty three, two years before the Wonder Beach murders, he had already been involved in a serious sexual offense in Sydney. Although the circumstances were different, investigators noted that violence towards women had appeared early in his life. It suggested that his offending had not suddenly begun in America. It had begun much earlier. Years later, after Wilder relocated to the United States, his criminal behavior escalated dramatically. He cultivated the image of a successful businessman and amateur photographer, using charm and promises of modelling opportunities to gain the confidence of young women. When his crimes were finally uncovered in nineteen eighty four, investigators across several American states began comparing notes. The resulting picture was one of an offender who had spent years perfecting methods of deception before his crimes escalated into murder. For Australian detectives, it inevitably raised another question had there been victims before the confirmed murders? Following Wilder's death during a confrontation with police in New Hampshire in April of nineteen eighty four, New South Wales detectives reopened aspects of the Wanda Beach investigation. They compared timelines. They examined witness descriptions. They reviewed everything known about Wilder's movements during the mid 1960s. They also ensured that biological samples connected to Wilder were preserved. Forensic science was advancing rapidly, and investigators recognized that evidence dismissed in nineteen sixty five might one day answer questions that had remained unresolved for decades. Despite that renewed effort, no direct connection emerged. There was no witness placing Christopher Wilder at Wonder Beach on january eleventh, nineteen sixty five. There was no forensic evidence linking him to the crime scene, there was no confession, no document, no photograph, no overlooked police report that suddenly transformed him from an interesting possibility into a genuine suspect. Behaviorally, investigators also encountered another difficulty. Many serial offenders demonstrate a gradual progression in their offending. Low level sexual offenses often precede increasingly serious crimes. Once they begin killing, however, that behavior rarely stops for long. If Wilder had murdered Marianne and Christine in 1965, investigators would have to explain why there appeared to be such a significant gap before his confirmed murders in America almost twenty years later. That doesn't make it impossible, every offender is different, but it does make the theory more difficult to reconcile with the patterns typically observed by behavioral investigators. Even so, Christopher Wilder's name has continued to surface whenever the Wonder Beach murders are discussed, partly because he was undoubtedly capable of extreme violence, partly because he was in Australia at the right time, and partly because so many questions about his early life remain unanswered. He has also been suggested also as a possible suspect in several other unsolved Australian cases from the nineteen sixties and the nineteen seventies. Once again, however, those suggestions remain exactly that. Suggestions No court has ever found Christopher Wilder responsible for those crimes, and no conclusive evidence has linked him to them. The Wonder Beach murders are no exception. For detectives, Christopher Wilder represented a line of inquiry that had to be explored. They explored it thoroughly. In the end, they reached the same conclusion that had frustrated investigators for decades. The theory was intriguing, but intrigue is not proof. More than sixty years after Marianne Schmidt and Christine Sharrock lost their lives, Christopher Wilder remains one of several men whose names continue to appear in discussions about the case. Whether he had any involvement at all remains unknown, and that uncertainty has become one of the defining features of the Wonder Beach investigation itself. Every promising suspect seems to answer one question, only to leave several more behind. If Christopher Wilder represented one possible explanation, the next suspect occupied a very different place in the investigation. For years, many detectives regarded Derek Ernest Percy as one of Australia's most dangerous offenders. Unlike Christopher Wilder, whose crimes became known overseas, Percy remained an enduring figure in Australian criminal investigations. His name surfaced repeatedly whenever police revisited unsolved murders involving children or young people, and before long it found its way into discussions surrounding Wonder Beach. Whether that suspicion was justified remains a matter of debate. Percy was born in Sydney on september fifteenth, nineteen forty eight, before his family later moved to Victoria. From an early age there were reports of troubling behavior. Neighbors spoke of women's underwear disappearing from clothes lines, others remembered Percy as an isolated young man who struggled socially and often kept to himself. On their own, none of these stories amounted to any kind of evidence, and many remained little more than local gossip. But as the years passed, investigators began looking back at those accounts through a very different lens. One incident in particular attracted attention. In nineteen sixty four, two schoolboys claimed they had watched Percy in Bushland wearing women's clothing while repeatedly stabbing items of female underwear with a knife. At the time, few people believed their story. Years later, after Percy's arrest for an unrelated murder, detectives wondered whether the boys had witnessed an early expression of violent fantasies that would continue to develop. Around the same period, Percy had also begun writing journals. Those writings revealed increasingly disturbing fantasies involving domination, violence, and children. Although disturbing, investigators were careful not to confuse fantasy with action. Many offenders record violent thoughts that are never acted upon. The challenge was determining whether Percy's journals reflected imagination or intent. By the mid nineteen sixties, another incident added to the police concerns. While living in Canberra Murrah, Percy persuaded two young girls into a caravan. Fortunately, the situation was interrupted before it escalated further. No charges were laid, instead the matter was dealt with privately. Looking back decades later, some investigators questioned whether an opportunity to intervene had been missed. Everything changed in nineteen sixty nine. That year, twelve year old Yvonne Tui disappeared near Beechport in Victoria. The investigation led police to Derek Percy. He was arrested, charged, and ultimately found not guilty by reason of insanity before being detained indefinitely in a psychiatric custody. The murder of Yvonne Tui remains the only homicide for which Percy was ever formally held responsible. Yet it was what investigators discovered afterwards that fueled speculation. Percy's journals contained violent fantasies, many centered on children. Some described abduction, others described attacks remarkably similar to offenses that remained unsolved elsewhere in Australia. Over the years, detectives from several states examined whether Percy could be linked to those cases. Among them were the disappearances of the Beaumont children, the murder of Linda Stilwell, and inevitably, the Wonder Beach murders. Supporters of the theory pointed to several similarities. Percy displayed a long standing fascination with knives, he had documented fantasies involving multiple victims, he had demonstrated an ability to conceal violent impulses behind an otherwise quiet exterior, and he had spent years travelling throughout Australia. To some investigators those similarities could not be ignored. Others remained unconvinced. The biggest obstacle was geography. Although Percy had been born in Sydney, there is no reliable evidence placing him anywhere near Wonder Beach on january eleventh, nineteen sixty five. Nor is there any witness who identified him. No photograph, no fingerprint, no forensic evidence, no confession. The further detectives investigated, the more the theory depended upon behavioral similarities, rather than demonstrable facts. That distinction is important. Behavioral analysis can suggest possibilities, it cannot establish guilt. Modern investigators continue to acknowledge Percy as someone who warranted investigation, but they also acknowledge that no evidence has ever conclusively connected him to Marianne or Christine. Like Alan Bassett, like Christopher Wilder, he remains another intriguing possibility. By the early two thousands, however, something had changed. It was no longer detectives alone who believed the Wonder Beach murders might finally be solved. For the first time since nineteen sixty five, science itself appeared ready to offer answers. The biological evidence recovered from the crime scene had been carefully preserved for decades. When DNA profiling emerged during the late twentieth century, investigators realized that evidence once considered impossible to analyze might now reveal the identity of the killer. The hope that had slowly faded over forty years suddenly returned. Perhaps the answer had been sitting inside an evidence locker all along, waiting for science to catch up. For decades the Wonder Beach murders remained trapped in time. The investigation had been exhaustive, thousands of witnesses had been interviewed, thousands of pages of evidence had been compiled, numerous suspects had been investigated and eliminated. Yet despite all that work, detectives remained without the one thing they needed most proof. When Marianne Schmidt and Christine Sharack were murdered in january nineteen sixty five, DNA profiling simply didn't exist. Detectives relied on fingerprints, blood typing, witness statements, and painstaking investigative work. If an offender managed to avoid leaving obvious physical evidence, solving the crime became infinitely more difficult. By the 1980s, however, forensic science had begun to change. DNA profiling was transforming criminal investigations across the world, solving cases that had once appeared impossible. Almost immediately, detectives began asking whether the evidence recovered from Wonder Beach could also be reexamined. Fortunately, investigators in 1965 had preserved a number of exhibits. Among them were biological samples collected during the post mortem examinations. For years they had sat in secure storage, offering little value to investigators working with the forensic techniques available at the time. Now, they represented something entirely different. Hope. As technology continued to improve throughout the 1990s and early 2000s, the evidence was examined again. Scientists were able to recover a partial DNA profile believed to belong to the offender. For the first time in almost 40 years, detectives possessed something capable of Of identifying a killer rather than simply describing one. It was a remarkable breakthrough, but it came with limitations. The profile was incomplete, good enough to compare against known individuals, not good enough to identify an unknown offender on its own. Even so, it dramatically changed the direction of the investigation. From that point onwards, every major suspect could be measured against the forensic evidence rather than simply against witness statements or behavioral theories. One by one, names were reconsidered. Some volunteered DNA samples. Others already had biological material available through previous investigations. Where comparisons could be made, detectives quietly began eliminating possibilities. It was a slower process than many people expected. Television dramas often portray DNA as providing immediate answers. Reality is rarely so straightforward. A partial profile can exclude a suspect with confidence. Identifying someone unknown, however, is considerably more difficult. Especially if that person's DNA has never been recorded. As the years passed, investigators continued submitting evidence for re-examination whenever advances in forensic science became available. Each new development brought renewed optimism. Each time, detectives hoped the latest technology might recover information that previous testing had missed. And each time they came away disappointed. The DNA remained frustratingly incomplete, enough to keep the investigation alive, but not enough to finally solve it. Despite those setbacks, the case has never truly been closed. New South Wales police continue to regard the Wonder Beach murders as an active investigation. Whenever new forensic techniques emerge, the evidence is reassessed. Whenever credible information is received, it is examined. The passage of time has never diminished the determination to identify the person responsible. More than sixty years have now passed since Marianne Schmidt and Christine Sharok set out for what should have been nothing more than a summer's day at the beach. Many of the original detectives are gone. Witnesses have grown old, some have died. The landscape itself has changed dramatically. Much of the Wonder Sand Hills has disappeared beneath housing developments and industrial estates. Visitors today would struggle to recognise the isolated dunes that existed in 1965. The place where the murders occurred has, in many ways, vanished. The mystery has not. Every few years the case returns to public attention a new documentary, a newspaper feature, a podcast, a fresh forensic review. Each brings renewed hope that the answer may finally be close. Because history has shown that time alone does not prevent a murder from being solved. Advances in science continue to rewrite what is possible. Cases once thought impossible have been solved after decades of silence. Families who believe they would never have answers have finally received them. There is no reason the Wonder Beach murders cannot one day join that list. Perhaps the person responsible has already died. Perhaps they lived an ordinary life carrying a secret that nobody around them ever suspected. Or perhaps the crucial piece of evidence has been sitting quietly in an archive for decades, waiting for someone to recognise its significance. Whatever the truth may be, one fact remains unchanged. On january eleventh, nineteen sixty-five, two fifteen-year-old friends travelled to Cronula looking forward to a day at the beach. They never came home. Marianne Schmidt and Christine Sharok have now become part of Australian criminal history. But they were never supposed to be. They were daughters, they were sisters, they were schoolgirls with plans for the future. And while their names have become synonymous with one of Australia's most enduring unsolved mysteries, it is worth remembering that before they became victims, they were simply two ordinary teenagers enjoying the summer holidays. Their killer took far more than two lives that day. He stole answers from two families. He shattered a community's sense of safety, and he left behind a mystery that has endured for more than six decades. Somewhere the truth still exists. Whether it lies in a forgotten witness statement, an overlooked piece of evidence, or advances in forensic science yet to come. The hope remains that one day Marianne Schmidt and Christine Sharok will finally receive the justice that has eluded them for so long. Until then, Wanda Beach remains one of Australia's greatest unsolved mysteries. This has been The Eclectic. If you found this story compelling, please follow, rate, and share the show. It helps others discover these deep dives into the strange corners of history. And if you have a family legend of your own, half truth, half-ghost story, I love to hear it. This has been the eclectic. Stay curious, stay questioning. And as always, stay on the city.