“Under investigation” STOCKTON, CALIFORNIA (February 7, 2017) – According to the California Highway Patrol, two people were killed on Tuesday in a head-on collision on Highway 4 west of South Whiskey Slough Road. (map) The CHP reported that a silver 2006 Chevrolet, driven by a 24-year-old Stockton man, was traveling eastbound on CA-4 around 2:43…