Murder of Helén Nilsson

| outcome = | reported injuries = | reported death(s) = Helén Nilsson | inquiries = | inquest = | coroner = | suspects = Ulf Olsson | charges = | verdict = Guilty | convictions = April 2005 | litigation = }} Ten-year-old Helén Nilsson was the victim in a sadistic murder case () in Hörby, Sweden, in March 1989. The murderer, Ulf Olsson, the so-called Helén man (), was convicted in April 2005, having been found after a DNA test in 2004.

Nilsson was abducted on the evening of 20 March 1989. She had decided to meet with two friends outside a grocery store, but they never met. She was found murdered six days later in the woods about 20 kilometres outside Hörby. Police discovered that Nilsson had been alive for a couple of days after the abduction. The murder remained unsolved for the following years and attracted media attention from time to time.

The murderer was first brought to the attention of the police at a private dinner. A police officer mentioned that she was involved with the investigation of the murder and this prompted a remark from one of the guests about a former colleague of hers, Ulf Olsson. Supposedly, there had been a lot of talking going on about Olsson at the time of the murder. The police who received the tip filed it, although it was not enough for an investigation. As a result, however, he would later be included in the group of 29 men who were asked to leave DNA samples.

In December 2004, Olsson was declared guilty and in April the following year he was sentenced to life, even though he had been found mentally ill. The verdict was appealed and the second authority determined the mental condition to be severe enough to warrant psychiatric care.

In the 2020 SVT television series ''The Hunt for a Killer'' (''Jakten på en mördare'') about the murders of Helén Nilsson and Jannica Ekblad, actor Magnus Schmitz played Ulf Olsson. Provided by Wikipedia