Found after a DNA-test in 2004 (a test series including 28 other men), Olsson was convicted to psychiatric care in 2005. Although he was first brought to the attention of the police during a private dinner in 2002, he had been in contact with two different police officers through anonymous letters and phone calls since only a couple of months after the murders.
The investigation is the second-largest in Swedish history, only surpassed by the investigation of the 1986 assassination of Swedish prime minister Olof Palme.
The murders
Helén Nilsson
Helén Nilsson was abducted on the night of March 20, 1989 and her body was found six days later. She had been alive for a couple of days after the abduction and had been raped. A number of leads were followed over the years but Olsson was not of any interest to the police until in 2002, when a police investigator involved with a recent re-opening of the case was informed of a man (Olsson) that had been suspected by the locals around the time of the murder. A tips was filed for him and in 2004 he was one of 29 men that were asked for a voluntary DNA sample. The test result indicated Olsson as the murderer with an error probability of one in 43 millions.
Jannica Ekblad
Jannica Ekblad was a prostitute in Malmö. She was found dead on August 4, 1989, and since Olsson, who has been convicted of killing her, claims he has never met her, the known details about her last hours in life are scarce. She did talk to a female prostitute friend through her house phone trying to have her follow Jannica and a man to a location outside of Malmö, but the friend was unable to. No names were used, but it is believed that the man was Olsson.
Jannica also visited a male friend of hers, who would occasionally provide her with heroin. Jannica made a short visit and appeared worried. She was seen leaving together with a man and no later observations were made of her. In 2004, large amounts of Jannica's blood were found in the summer cabin that belonged to Olsson at the time of the murder and together with his sperm being found in her vagina and other evidence, this enabled the conviction of him.
Connection between the murders
The police technician responsible for the two murders was in an early stage convinced that the same killer was responsible for the two murders. Although there were clear differences in the two victims (a young girl and a prostitute), other parameters such as the type of location in which the bodies were discovered, the combination of strangulation and massive force against their heads as well as the presence of dog's hair on both bodies, made the investigators suspect there was a connection. Before the proofs against Olsson had been collected in 2004, however, there was no established connection between the murders.
Death
At 5:00 am CET on 10 January 2010, Ulf Olsson published a post on his blog where he stated "the best thing for me is simply to die, rather than to sit here as a living dead" (Swedish: det bästa för mig är helt enkelt att bara få dö, än att sitta här som en levande död).
At approximately 6:15 am CET the same morning, Ulf Olsson was found lifeless by staff of the psychiatric clinic where he was situated. Officials of the psychiatric clinic confirmed that he had committed suicide.
Wikipedia.org