FREMONT COUNTY, Iowa (AP) — Authorities have released the name of a Colorado man whose body was discovered under a highway bridge in southwest Iowa.

The Fremont County Sheriff’s Office identified the man as 39-year-old Larry Burns II, of Lamar, Colorado. The Sheriff’s Office says Burns fell from the shoulder of the U.S. Highway 2 bridge while walking in the Waubonsie Access Wildlife Management Area. His body was found by hunters on Dec. 11.

The Sheriff’s Office says an autopsy showed Burns died of head injuries and hypothermia. A report on toxicology tests isn’t expected for at least six weeks.