A head-on collision Monday afternoon killed a young northwest Iowa man. A 19-year-old Sioux City man was killed when his car collided with a truck on Highway 12 four miles south of Westfield. The victim was identified Tyler Osterkamp. According to the State Patrol, the Osterkamp car was southbound, crossed the center line and hit the northbound truck head-on. The truck driver was taken to a Sioux City hospital, treated, then released.