The man accused in the 2012 shooting death of Justin Ferrari pleaded guilty on Tuesday.
A stray bullet struck Ferrari in the head as he was driving through an intersection with his parents and his two young children in the car.
Andrew Patterson pleaded guilty to second degree murder and will spend at least 15 years in prison.
"The random, tragic and senseless death of Justin Ferrari was the result of this defendant's decision to use a gun to settle a petty dispute," said King County Prosecutor Dan Satterberg. "Every person in the neighborhood was a potential victim of his irrational and erratic use of deadly force."
Sentencing is set for August 23.