Officers went to the apartment on Jacques Cartier Boulevard around 11 p.m. after receiving a 911 call.
“It’s a suspicious death because we don’t know the nature or the circumstances around this scene. That’s why investigators have been called to the site,” said Ghislain Vallieres, spokesman for the Longueuil police.
Vallieres said the man appears to be in his 50s.
Police are trying to determine what happened inside the apartment where the man was found.