According to SVT, the suspect, who was born in 2010, was arrested at lunchtime on Wednesday and remanded in custody on Friday afternoon.
On the eve of the Walpurgis Market, a man in his 20s was shot in Norrköping. He later died of his injuries.
On May 4, two teenage boys were arrested on probable cause for murder and aggravated weapons offenses. Another teenager under 18 was arrested on May 8.
In addition, a person younger than 15 is also suspected of being involved in the murder. The person has been taken into care by social services.
