A new theory suggests that an unknown individual may have been involved in the murders, proposing that they were carried out not by one person, but possibly two or even three. This theory is supported by testimony from two witnesses, whose statements were made public by the police only years later. Moreover, a recent discovery on the internet could potentially be a groundbreaking revelation.

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• Rudolph Isler

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In episode five we take a close look at Carl Doser, the man that officially owned the murder weapon but fooled the police when questioned about his Winchester 20 years ago. How and where he grew up as well as his social and family background. And we’ll focus on a private investigator that wrote a book about the murder and for the first time ever came up with a motive and theory.

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• Rudolph Isler

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The sensational discovery of the murder weapon, found hidden behind a kitchen unit in an apartment in the town of Olten almost 30 years after the crime, not only renewed the investigators' hope but also raised a multitude of new questions. Once the registered owner was identified, the police initiated an international manhunt, but the results were less than promising.

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• Rudolph Isler

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Taking a close look at the arrest of Robert, the murdered couple's son, and his girlfriend Anita, whom the police considered the prime suspects. But them having ironclad alibis soon Roberts estranged cousin 'Johnny' entered the scene, not least because a few weeks prior to the murder he was seen at a Basel gun store buying ammunition.

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• Rudolph Isler

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Episode 2 takes a closer look at the victims, especially at Eugen Siegrist, the owner of the cabin and most likely the main target of the assassination and we will look at the Friday, the day prior to the murder when some rather odd events occurred at Eugen's work place. We then try to establish a detailed account of the events as they could have enfolded on the fatal day in June.

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• Rudolph Isler

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On June 6, 1976 a 28 year old daughter finds her parents and aunt along with her two sons murdered at her father's remote weekend cabin in the Swiss countryside. All five victims showing at least one bullet hole in the forehead, hence were shot at point blank range. Apparently none tried to escape or intervene. Thirteen shell casings were found at the scene of the crime and the murdered couple's car, that the murderer/s used to escape, was located the same day 30 km away. The couple's son (20) became the prime suspect. Yet neither a motive nor the murder weapon could be found.

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• Rudolph Isler

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A gripping true crime podcast delving into Switzerland’s most talked-about and perplexing murder case. Five family members executed with chilling precision. Shot at point-blank range in the forehead. The crime bears a haunting resemblance to a Mafia contract killing, and its motive continues to elude the police, shrouded in mystery to this day.

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• Rudolph Isler

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The episode explains the 30 year staute of limitations for capital crimes in Switzerland and describes the pro and cons of the abolition bill currently under discussion in the Swiss parliament.

Important Update: The website thecrystalcavemurders.com has been replaced by swissmurdermysteries.com

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• Rudolph Isler

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