Seattle cop hit, killed on freeway while helping another driver involved in a crash; officer's car stolen

An off-duty Seattle police officer was struck and killed by a vehicle while helping a driver who had been in an accident on a freeway early Sunday, authorities said.

That's when another vehicle that was not involved in the collision struck and killed the officer, Washington State Patrol said.  That driver stayed on the scene and was cooperative with investigators, WSP said.  No one else was injured in the collision, but an individual involved in the pileup allegedly stole the slain officer's vehicle and took off.