A crash that killed four teens in west Marin — after their SUV veered off the road to avoid an oncoming car, according to a survivor — has left families grieving on both sides of the county line.

Four teenagers were killed in a car accident Friday evening when they crashed into a tree in rural West Marin.

One of the surviving victims of last week’s deadly Marin County car crash returned home on Tuesday. The crash happened Friday night on San Geronimo Valley Road, south of Sir Francis Drake Boulevard, according to the California Highway Patrol.