The Rupperswil Murders: The most shocking family massacre of the decade — and the challenge that pushed Swiss police to their limits.

 The Rupperswil Murders: The most shocking family massacre of the decade — and the challenge that pushed Swiss police to their limits.

On the morning of December 21, 2015, neighbors in the small community of Rupperswil noticed smoke coming from a single-family home on Hintergasse.

Many initially thought it was a kitchen fire or an accident. But when the fire department arrived and forced open the doors, they were met with a sight that shocked even experienced emergency responders. Inside the house, they found four bodies, bound, some lying on top of each other, with signs of violence and a deliberately set fire. It quickly became clear that this was not an accident, but a crime.

The victims were Simona S., 48 years old, her two sons Dion, 19 years old, and Davin, 13 years old, and the older son's girlfriend, Carla, 21 years old.

The investigation was in full swing from the start. Specialists examined the scene of the fire, forensic evidence was secured, and witnesses were interviewed. But the police were initially baffled. There was no evidence of a break-in, no clear motive, and no obvious connection to a perpetrator. The fire had been set to destroy evidence, and the victims had apparently been held captive for hours. Suspicions soon grew that this was a planned crime with a sexual motive and the intent of extortion.

The special commission worked for weeks without making a breakthrough. The uncertainty terrified the public.

In February 2016, a reward of 100,000 Swiss francs was offered for information leading to the solution of the crime. That was the highest amount in Swiss criminal history. The investigation proved difficult because there was no relationship between the perpetrator and the victims.

On May 12, 2016, almost five months after the crime, the perpetrator was finally arrested, and the crime was proven using DNA and fingerprints. How the police found the perpetrator remains officially secret.

The confessed perpetrator is Thomas N., 33 years old at the time of his arrest, who lived with his mother in a house in Rupperswil, 500 meters from the crime scene. He is single and claimed to be a student. He worked as a junior soccer coach and as coordinator of the Seetal Selection, a cooperative team between SC Seengen and FC Sarmenstorf.

He chose the victim's family because of his sexual interest in their younger son. He claimed to have seen 13-year-old Davin walking his dog several times and to have developed a strong obsession with him. From then on, he also took his dog out several times at the same time, just to "discreetly" meet Davin.

His confession sent chills down the spines of even the most experienced detectives.

That morning, Thomas N. was observing the family's home. Before the murders, he had studied the family's schedule and spied on them for weeks. At that time, Simona, her two sons Dion and Davin, Dion's girlfriend, and Simona's partner were in the house. Thomas N. waited until Simona's partner left the house and went to work.

Around 7 a.m., the family’s doorbell rang. He then gained access to the house by using a fake business card to identify himself as the school psychologist at Davin's school. He claimed that Davin had been involved in the bullying of a classmate, who subsequently committed suicide. After a conversation with him, he threatened Davin with a knife and forced Simona to tie up Dion and his girlfriend with the cable ties he had brought with him. Thomas N. forced Simona to withdraw cash. The frightened mother then withdrew Euros ca. 1160 US-Dollar from a Hypothekarbank Lenzburg ATM in Rupperswil and 9850 Francs ca. 12360 US-Dollar from the Aargau Cantonal Bank counter in Wildegg (which was documented by surveillance cameras).

Upon her return, Thomas N. tied Simona up and then abused Davin with a sex toy he had brought with him. He filmed the sexual abuse on eight cell phone videos and then tied and gagged him as well.

He then killed all of his victims. The first victim was 19-year-old Dion, who had previously freed himself from his restraints. He killed all the other victims in the same manner. He then set fire to the bodies and the house, using accelerants he had brought with him to cover his tracks. Not all details of the crime could be reconstructed, as none of the victims survived and the defendant's statements partially contradicted the evidence. The perpetrator transferred the photos and video recordings to his laptop on the day of the crime.

The quadruple murder in Rupperswil is considered one of the most brutal crimes in Swiss criminal history.