The initial investigation revealed Phetteplace was driving a 2008 black Subaru Impresa eastbound on highways 11 and 14 when he went into the westbound lane and struck the semi head on.
Phetteplace was the sole occupant in his vehicle and was not wearing his seatbelt, according to the release. He was pronounced dead at 4:35 p.m.
The semi-tractor and trailer was driven by Dennis Bennington, 55, of Coon Rapids, Minnesota. Bennington was the sole occupant in the semi and was not injured.
The crash remains under investigation by the Walworth County Sheriff’s Office Crash Investigation Unit and the Walworth County Medical Examiner’s Office.
Besides the Walworth County Sheriff’s Office, responders included the Darien Fire and EMS, Mercy MD1 doctors, the Rock County Sheriff’s Office, the Wisconsin State Patrol, and the Walworth County Medical Examiner’s Office.