Three people are dead after three separate traffic collisions in Calgary on Sunday night.

Just after 9 p.m. a man in his early 20s was hit by a passing vehicle as he walked along the side of Highway 1 just west of Valleyridge Boulevard N.W.

The vehicle that struck the man was later located and police are investigating. The victim’s name has not been released yet. Alcohol is not believed to be a factor.

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An elderly woman was killed late Sunday on 17th Avenue southeast in one of three fatal collisions in Calgary. (CBC)

Around 9:30 p.m. two pickup trucks collided head-on in the 100 block of 17th Avenue S.E., killing one of the passengers, a woman in her 70s, police said.

The man who was driving that truck, along with two young children, were taken to hospital.

"Stars had to be brought in to transport the worst injured child to the children’s hospital," said Duty Insp. Paul Stacey.

All three are in stable condition with non-life-threatening injuries.

"We believe alcohol was an absolute factor in that one. We have the person in custody that was driving the vehicle the wrong way," said Stacey.

Charges are pending.

In the third collision, just after 10:30 p.m., a pickup truck hit a 56-year-old male pedestrian in the 5500 block of Hubalta Road S.E.

Emergency crews pronounced the man dead at the scene. He was not in a crosswalk. Alcohol and speed were not factors, police said.