The Seewen murder case (1976) was one of the biggest Swiss crime cases and is the biggest Swiss murder case. Five people were killed, and the suspect remained unknown after the 20-year time bar expired in 1996.
The killings took place during the Pentecost weekend of 1976, in a weekend house named "Waldeggli" located in a small allotment garden. The allotment garden stood in a protected forest in Seewen, Dorneck, Solothurn, Switzerland. Five were killed during 13 rounds of shooting with a Winchester rifle. Eleven of the shots hit the head region of the victims while the other two shots landed in the chest region of the victims. Robert Siegrist, the son of two of the victims Eugen and Elsa Siegrist-Säckinger, wrote in his book Der Mordfall Seewen that one of the victims was shot four times in the head, with each shot hitting the victim with precision.
The five victims were:
The crime was discovered on June 6, 1976 by a female walker. When the police arrived, they found four corpses in the house with the fifth wrapped in a carpet on the terrace. It is suspected that only Elsa and Eugen Siegrist-Säckinger were meant to be killed, but the killer was surprised at the presence of the other three people and killed them as well.
The criminal investigation department followed many leads and systematically searched for owners of Winchester rifles. However, there was little hope of finding the culprit until the fall of 1996, when a Winchester rifle was found hidden in the walls of a kitchen of a house belonging to a woman named Doser. The gun, which belonged to Carl Doser, was an Italian Winchester imitation with a short barrel. It was identified as the weapon used to kill the victims.
It was discovered that Carl Doser was a loner living in Basel. He had legally bought the rifle in 1973 from Hofmann & Reinhart Waffen AG. He had earlier been interviewed by the police, but he lied, telling them he had sold the gun on the flea market. However, Doser was not charged because a clear motive for killing the victims could not be found, with no recorded meeting between Doser and the victims. However, the majority of the Swiss population still believe Doser was the killer.