01/17/2014 09:10 EST | Updated 03/19/2014 05:59 EDT

Driver in Coquitlam hit-and-run likely unaware, says witness

A witness to a deadly hit-and-run in Coquitlam, B.C., on Thursday believes the driver didn't realize they had hit somebody.

An 85-year-old woman died shortly after being hit in the driveway of her son’s home on Austin Avenue, where the man runs an acupuncture clinic.

A neighbour, Trevor Stewart, believes the woman was unwittingly hit by one of his patients.

"I don't think they knew,” says Stewart. “They backed up slowly, and it wasn't like they were in a hurry to go anywhere. They just pulled ahead slowly — and that's when I noticed her lying there, because I heard the scream.”

“My friend said he thought it was the sound of tires, and I said, no, it wasn't tires. And I looked over and I saw her lying there."

Stewart says his friend rushed after the car, but couldn't stop it and wasn't able to see what the driver looked like.

The only description of the car so far is that it is a silver four-door.

The incident occurred just blocks from where an elderly couple was hit and killed by a vehicle back in November. The driver drove off in that case as well, but RCMP eventually made an arrest after a tip from the public.

RCMP are appealing to the public for help with Thursday's incident, asking any witnesses or people with information to call them at 604-945-1550, quoting file number 2014-1438.

Google Maps: Austin Avenue, Coquitlam