The man who caused a fatal four-car crash in Quebec's Pontiac region has previous convictions related to impaired driving, CBC News has learned.

Three people were killed, including a father and his four-year-old son, and two others were seriously injured in the crash, which happened around 6:15 p.m. Tuesday on Highway 148 near Quyon, Que., about 50 kilometres northwest of Ottawa,

Outaouais police officers responded and found a red car that was damaged beyond recognition.

Kevin Black, 51, of Bristol, Que., who was driving that car, and his young son died at the scene.

Black's 12-year-old stepdaughter and 13-year-old stepson survived, but were sent to the Children's Hospital of Eastern Ontario. They were admitted in critical condition, but have been upgraded to stable condition.

Campbell's Bay, Que., man caused crash: police

The third person who died has been identified as John Robertson, 51, of Campbell's Bay, Que. Police said he was driving alone when he tried to pass another vehicle, crossed the centre lane at a curve in the road and was "100 per cent" at fault for the collision.

CBC News has learned Robertson has a 1997 conviction for refusing a breathalyzer test. Toxicology results in this crash, though, are not expected for a few weeks.

The people in the other two vehicles involved were not hurt.

Highway 148 was shut down in the area all night as police investigated, but reopened around 5:30 a.m. Wednesday.

Police continue to investigate but said the crash was caused by one vehicle trying to pass at a curve in the road.