The Montgomery County Coroner’s Office confirmed the death Friday, saying Walther was reported dead Thursday night and that the cause of death hadn’t been determined.
Walther also drove briefly in NASCAR, finishing 12th in the 1976 Daytona 500.
At the start of the 1973 Indy 500, Walther’s car pinwheeled down the track, his legs sticking out of his torn up racer, after touching wheels with Jerry Grant and slamming into the catch-fencing in a fiery crash near the starting line. Blinded by the fireball that spread across the front straightaway, several other drivers slammed into Walther’s car.
Walther fought an addiction to pain killers after the accident and spent time in jail and prison. He was arrested in Dayton last month in a case dating to 2007, and it wasn’t immediately known if he was incarcerated at the time of his death.