Attorney General Marty Jackley and Yankton County Sheriff Jim Vlahakis released preliminary autopsy results in the investigation into the death of 18 year old Justin Baron Arcoren of Chamberlain.

Arcoren was found deceased on December 24, 2017, at approximately 2:30 a.m. (CST) on U.S. Hwy 81, approximately 4 miles north of Yankton.

Preliminary autopsy results indicate the cause and manner of death was accidental due to blunt force injury to the head and chest due to pedestrian struck by vehicle.

Agencies assisting in this investigation are the Yankton County Sheriff’s Office, South Dakota Highway Patrol and the Division of Criminal Investigation.