Police in the Outaouais have concluded that a 77-year-old man who was killed in a fatal collision earlier this week fell asleep behind the wheel.

Lawrence Morin, of Val-des-Bois, was killed when his car rear-ended a dump truck on Highway 309 in L'Ange-Gardien on Tuesday.

The dump truck was stopped in traffic when the collision occurred.

Police say speed and alcohol were not factors in the crash.

L'Ange-Gardien is located about 30 kilometres northeast of Gatineau.