RANDOLPH, Mo. — The Clay County Sheriff’s Office is investigating a deadly workplace accident that occurred Monday afternoon.

Deputies responded to Martin Marietta Materials near Northeast 4th Street and Randolph Road, just east of Interstate 435, around 5 p.m.

The sheriff’s office says they found 42-year-old Bobby Joe Allen, of Gladstone, on the ground. They believe Allen fell three or four stories from a catwalk. He landed on rocks below and died from injuries according to the deputies.

While investigators said there is no evidence of foul play, they also couldn’t find anyone who witnessed the fall. Because of the lack of witnesses, deputies say they aren’t sure exactly when or why Allen fell.

The deadly fall remains under investigation, and the Occupational Safety and Health Administration will also look into what happened at the business.