Christopher Robert, who was the head of anesthesiology at Hennepin County Medical Center, was found dead on the interstate near the Lowry Tunnel on the morning of Dec. 5, 2015.
The medical examiner released more details on his cause of death Thursday, saying Robert died of a "blunt force head injury sustained in an apparent fall."
Robert's death was ruled an accident, but officials didn't elaborate on what happened. In the days after Robert's death, his wife said he was walking to their downtown Minneapolis home from a workplace Christmas party sometime before his body was found.
A spokeswoman with the county told the Star Tribune the autopsy also determined "acute alcohol intoxication" was involved in his death.
Minneapolis police are investigating, the report notes.