A man who worked at a popular Ohio bowling alley was crushed to death in a freak accident that has prompted an investigation by the Occupational Safety and Health Administration.

An OSHA investigator was at the bowling alley Friday, a day after David Geiger, 53, was pulled to his death after getting entangled in a pin-setting machine he was trying to repair. The mishap occurred at Northwest Lanes outside Cincinnati.

WCPO-TV reported there were bowlers and other workers at the bowling alley at the time but no one saw what happened.  The coroner in Butler County ruled Geiger’s death accidental traumatic asphyxia.

“He was sent back for a problem with one of the lanes,” Fairfield police spokesman Doug Day told the station. “He’d been back there, they tried to call him, and when he didn’t answer the call they went back there and they found him.”

The station said Geiger had been working at the bowling alley for four years. A former co-worker Nathan Hursell said Geiger had been employed by bowling alleys for 30 years.

“Dave was a stand-up guy,” Hursell told WCPO. “He knew exactly what he was doing back there. It’s one of those things where you don’t think twice of that happening. It’s just a common spot that we get in the machines and it’s just a freak accident.”

The Associated Press contributed to this report