A semi-truck driver was being held on vehicular homicide and vehicular assault charges after a crash that killed one person Tuesday on Highway 285 near Conifer. The highway was closed in both directions for about 14 hours after the crash, which happened around 5 p.m. The Colorado State Patrol said the semi was going south when it went off the edge of the road, rolled onto its side and dumped its load of pipe and angle iron on top of five other vehicles. The driver of one of those vehicles, a gold Ford F-250, died on the scene. The Jefferson County Coroner's Office identified him as Scott Miller, 64. The driver of one of the other vehicles, a 2003 Subaru Legacy, suffered serious injuries, CSP said. CSP said the driver of the semi, 47-year-old Ignacio Cruz-Mendoza, was arrested Tuesday night. He is being held on charges including vehicular homicide and vehicular assault.