Laval police reopened des Laurentides Boulevard to traffic Thursday at 4 p.m., 13 hours after a fatal collision left one man dead and another critically injured.
The crash happened overnight at around 3 a.m., near the intersection of des Laurentides and Cartier boulevards.
Const. Franco Di Genova said one car was heading northbound and another southbound when they hit each other.
The man who was in the passenger seat of the car travelling south, a blue Volkswagen GTI, was killed, Di Genova said. He was in his early 20s.
The driver, also a man in his early 20s, was taken to hospital in critical condition.
Des Laurentides Boulevard was closed in both directions between Cartier Metro Station and Grenon Street, as collision reconstruction experts investigated the incident.
A number of bus lines were also affected by the closure.