Former hockey pro Janne Puhakka -- Finland's first openly gay player -- was found shot to death on Sunday ... and police believe his partner was behind the killing.
Puhakka was only 29.
According to a report out of Finland, Janne was found in his Henttaa Espoo home ... where he lived with his partner, 66-year-old veterinarian Rolf Nordmo.
Police said the death was a homicide and suspected Nordmo was the shooter. He was arrested at the scene without incident.