A Good Samaritan who had four children, including an infant, and a woman she was trying to help were killed after they were struck by a hit-and-run driver in Coquitlam early Saturday.

Staff Sgt Mark McCutcheon said around 12:25 a.m. a Nissan Pathfinder SUV hit a concrete barrier and spun around at Pitt River Road and Lougheed Highway. He said the female driver and her boyfriend who was in the passenger seat were shaken but not seriously injured.

McCutcheon said a husband and wife couple went across the highway to help the victims. The man's wife was standing outside the vehicle on the passenger side helping the other woman when a 1995 white Jeep Grand Cherokee side-swiped the SUV. The driver hit the two women and the boyfriend and drove off.

Both women, aged 27 and 30, died at the scene. The man who was in the passenger seat of the SUV was taken to hospital with serious injuries, McCutcheon said.

Investigators located the Jeep abandoned in another area of Coquitlam called Cape Horn about two or three kilometres from the scene of the incident and are now looking for the driver whom they believe fled on foot.

"We have some suspicions about who was driving but we are not sure yet," he said.

The female driver was from Port Coquitlam. Her boyfriend is at Royal Columbian Hospital suffering from head and leg injuries but is expected to survive. The Good Samaritan was the mother of four children between the ages of one and 10. Her husband witnessed the accident and is "terribly distraught," said McCutcheon.

"He is working with victim services but obviously he is not doing well. The officers who were on the scene are also getting counseling. They were pretty shaken up."

Police are asking that anyone who has information about the fatal hit-an-run call Coquitlam RCMP.

McCutcheon appealed to the driver to turn himself in.

"Do the right thing. Call your lawyer whatever you need but turn yourself in. I know that this is probably a horrific thing that has happened to him He's probably scared and maybe that's the reason he did what he did. But now do the right thing for the family so they can have closure."