Charlene Reaveley, a mother of four young children, died while on the side of the Lougheed Highway helping Lorraine Cruz who had been in an earlier accident.
Reaveley said his wife had gone out to comfort the Cruz, who was crying. Both women were struck and killed at the scene.
"We'll see what happens to the justice system," he said to reporters outside the courthouse after testifying Wednesday. "And hopefully something comes of it and they can make an example of people like this."
Cory Sater pleaded not guilty to all 10 charges against him, which include dangerous driving causing death, impaired driving causing death and failure to stay at the scene.
The CBC's Renee Filippone was at the New Westminster courthouse covering the trial and files this video report.