The police were alerted to a shooting in the Hageby district just after midnight on June 3 last year. Inside an apartment, two men in their 30s were found shot dead.
The 20-year-old, who was arrested nearby shortly afterwards, had according to the investigation broken into the residence by smashing a window. Once inside the apartment, he shot the men with an automatic carbine. Both were hit by seven shots each.
"Even though it's a shorter sequence of events, the victims must have had time to feel intense fear of death," says prosecutor Lisa Åberg in a press release.
The suspected shooter is previously unconvicted and from Västra Götaland. According to a minor psychiatric evaluation, he is suspected to be suffering from a serious mental disorder.
Two other men, 19 and 20 years old, are being prosecuted for aiding and abetting the murders. They are suspected, among other things, of having participated in the planning of the shooting.
All three deny involvement in the murders.
The indictment reveals that the murders are linked to a conflict between criminal networks in Norrköping, and that there was a threat against a relative of one of the murdered.
Much suggests, according to Åberg, that one of the murder victims was not an intended target but was present by chance.
"The shooter has no relation to the victims and I assume that he carried out the act on behalf of someone else," she says, adding that the work to establish who gave the order continues.
The double murder led to the police setting up a so-called security zone in Hageby two days later – the first ever in the country.