The Cass County Sheriff’s Office identifies the victim as 32-year-old Matthew Tritsch.
The office reports deputies found Tritsch dead at the scene, about two miles southwest of Murray.
According to the accident report, Tritsch was driving his pick-up south on 36th Street when it crashed through a bridge railing and landed on its side in a creek.
Witnesses reported seeing the same pick-up earlier on Waverly Road, west of U.S. 75, running over a number of mailboxes.
The investigation continues.