One witness came forward Monday as Longueuil police remained at the scene of a deadly shooting.

An 18-year-old man died after being shot Sunday night in Longueuil.

Residents heard people fighting and then reported hearing shots fired on Grant St. near Saint-Foy Blvd. just after 6 p.m.

The victim was with his girlfriend at a local Subway restaurant when he was confronted by the man. A fight reportedly ensued and escalated when they left the restaurant.

He man was shot about a block from the restaurant. He was rushed to a South Shore hospital where he was pronounced dead.

Police are looking for a man dressed in in dark clothing who was spotted running away from the scene.

It’s not clear if the victim and the suspect knew each other or what the motive may have been.

This is the fourth homicide of the year in Longueuil.