A 27-year-old man was shot dead next to a car in Bagarmossen on October 23. The investigation indicates that he was not the intended target, according to the prosecutor.
The teenage boy is over 15 and was arrested on Friday morning.
A 36-year-old man has already been detained on suspicion of murder. Two other people, a man and a woman, are suspected of being accessories but have been released after questioning.
The detention hearing is scheduled for Saturday.
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