A northwest Iowa man was killed Monday night in an accident involving a car and a semi-truck. Sioux County sheriff’s authorities say a car driven by 18-year-old Patrick Duffy of Sac City was eastbound on Highway 18 and veered into the westbound lane and hit the semi-truck head-on.

Duffy was pronounced dead at the scene by the Sioux County medical examiner. The driver of the semi, 55-year-old Andy Enyart of Waukon, Iowa, was taken to the Sheldon hospital by ambulance for treatment of minor injuries. The accident occurred just east of Boyden around 7:30 last evening. The accident remains under investigation.