Fort McMurray man killed in May long weekend collision on Highway 63

File: RCMP cruiser. File photo

A 47-year-old Fort McMurray man was killed in a three-vehicle collision on Highway 63 Sunday morning.

Three other people, including a 12-year-old boy, were injured in the crash. It happened at around 9:50 a.m. at the intersection of Highway 63 and Highway 18 in Thorhild County, about 88 kilometres north of Edmonton.

RCMP said a tractor trailer heading west on Highway 656 entered the intersection at Highway 63 when it was struck by a southbound SUV. Highway 656 turns into Highway 18 at the Highway 63 intersection.

The tractor trailer then swung across the highway into eastbound traffic and collided with a stopped car that was waiting to cross the highway.

READ MORE: Deadly May long weekend on Alberta roads

The 47-year-old man driving the SUV was pronounced dead on scene. His name is not being released. The 12-year-old passenger in the SUV, also from Fort McMurray, was taken to hospital in Edmonton with serious injuries. Police said he remained in hospital Tuesday in stable condition.

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The 40-year-old man driving the car was treated on scene and released with minor injuries. A 41-year-old female passenger was taken to an Edmonton hospital where she remains in stable condition.

The 24-year-old man driving the tractor trailer unit was not injured.

READ MORE: Alberta RCMP issue May long weekend warning after recording 17 traffic deaths so far this month

The cause of the collision is still under investigation.