They add his death will not be the subject of a criminal investigation. He was one of two people seriously injured at the Sonisphere Music Festival held earlier this month in Pori.
A sudden and unusually powerful storm surprised festival fans and knocked part of a stage into the crowd.
Winds ripped apart one of the main stage's support scaffolding and sent it flying into the crowd. Altogether around 40 people were injured, with two requiring hospitalisation at the time.