The hour-long special seeks to reveal what happened when the late fitness guru vanished from the public eye, sparking years of speculation about his well-being.

Here's how to watch ABC’s “The Mystery of Richard Simmons” on-demand if you missed it live with these free streaming options.

A new Diane Sawyer special takes a closer look at one of America’s most beloved and enigmatic personalities. “The Mystery of Richard Simmons: A Diane Sawyer Special” airs Tuesday, May 12, from 9–10 p.

‘The Mystery of Richard Simmons - A Diane Sawyer Special’ is an ABC special exploring the legendary career of Richard Simmons, with a particular focus on his abrupt departure from the public eye. The ...