Whitcomb says police want to confirm the man’s identity so they can remove him from the potential suspect pool as they conduct forensic analysis.
The witness is described as a black man with facial hair, about 6-feet tall with a thin build and he wore a white brim hat, glasses and a green argyle shirt.
Seattle police ask anyone with information on the man to call the Seattle Police Homicide division at 206 684-5550.
Chin, the founder and director of the International District Emergency Center, was shot while driving near Eighth Avenue and South Weller Street around 3 a.m. Thursday. Multiple people called 9-1-1, but Chin died after being taken to Harborview Medical Center.
Chin has been remembered as a hero who championed for safety in the International District, where he grew up. Chin was tireless in his efforts to improve public safety in the International District, personally patrolling the area himself and often responding to medical emergencies and dangerous situations before Seattle Police or Fire arrived at the scene.