WALNUT CREEK — Authorities say they will never know what drove a man to fatally shoot a California Highway Patrol officer during a freeway traffic stop.
An investigation by the Contra Costa County Sheriff’s Office revealed Thursday that there was no motive or indication 36-year-old Christopher Lacy was going to shoot officer Kenyon Youngstrom after he was pulled over on Interstate 680 in Alamo in September.
However, investigators later discovered that Lacy had suffered a mental breakdown while attending college and was diagnosed with bipolar disorder.
They also learned that Lacy’s behavior had become increasingly erratic in recent years and the handgun he used in the shooting was purchased legally and registered to him.
Lacy shot the 37-year-old Youngstrom who died in a hospital the next day after being taken off life support. Lacy was killed by Youngstrom’s partner, CHP officer Tyler Carlton.