Autopsy results conclude a University of New Hampshire student who was found dead in a marshy area had drowned and the manner of his death was accidental.

Police in Durham released the information in the death of 22-year-old Vincenzo “Vinny” Lirosi, of Whitman, Massachusetts. He was found Sunday.

Durham police said Lirosi was out drinking with friends early Saturday before he went to a Sigma Chi fraternity party and got into a fight. The chapter said Lirosi had gained access without permission to a “welcome home” event for a member who was returning from military service.

The chapter is complying with interim suspensions issued by the Sigma Chi International Fraternity and the university and is cooperating with authorities.