Police received information that a yellow van, possibly a Dodge, was traveling northbound on state Highway 84 directly in front of the collision, which took place just south of Ruby Hill Drive at about 2:45 p.m. Saturday.
The van had side windows that were painted yellow, according to police, who say there is no indication that the vehicle was involved in the collision but may be able to provide information about its cause.
Jonathan Manzo was killed after the 17-year-old driver of a 2006 Toyota Corolla crashed when he attempted to pass another vehicle through the merge and lost control of his car, police said.
The Toyota slid sideways and was broadsided by a 1997 Mercury minivan carrying a woman driving her three children, according to police.
The woman, 55, her 15-year-old son, 12-year-old daughter and 10-year-old son were taken to a local hospital where the youngest child succumbed to his injuries, police said.
The driver of the Toyota, a 17-year-old Lathrop boy, was also taken to a hospital where he is still being treated for chest injuries. The 12-year-old passenger of the minivan was released from the hospital late Tuesday, police said.
There is no indication that alcohol or drugs were related to this collision, according to police.
Anyone with information regarding the collision is asked to call Officer Glen Robbins at 925-371-4855.
Here's a link to a condolence page for the Manzo family.