Authorities responded shortly before 1 p.m. Tuesday to the collision in the 500 block of Merriewood Drive and took the boy, a Lafayette resident, to a hospital where he later died.
The Amazon vehicle driver cooperated with investigators, who took blood from him for testing, sheriff's spokesman Jimmy Lee said.
RELATED: 3-year-old boy dies after being hit by pickup truck in San Jose
Lafayette police are asking anyone with information about the collision to call (925) 283-3680 or (925) 299-3234 or email Sgt. Rossberg at tross@so.cccounty.us.
Video in the media player is from Tuesday, July 29.