as nick watt finds >> reporter: richard simmons, e va van ja list, showman, sweating to the oldies forecades. simmons dolled out love, and he dolled out weight loss advice to everyone he met. >> don't eat in the car. that's number one. >> reporter: some shunned famous. simmons embraced it. always accessible and present. then in early 2014 just months after that thanks giving appearance, simmons suddenly vanished behind the walls of his home. fans asked why and conspiracies swirled. >> let's discuss the two main theories at that time. >> reporter: now three years later, simmons still out of the spotlight and his disappearance from public life is the s of the number one pod cast, missing richard simmons. >> three years ago to the day richard simmons stopped being richard simmons. i want to find out why. >> i met him in 2012. i wanted to tell his story before this happened. the fact that he disappeared like he did? just kind of made it more urgent. >> reporter: a one time producer for the daily show, one of many who was hooked on the simmons workout, payment friends with the fun-loving fi

. >> reporter: richard simmons, e va van ja list, showman, sweating to the oldies for decades.immons dolled out love, and he dolled out weight loss advice to everyone he met. >> don't eat in the car. that's number one. >> reporter: some shunned famous. simmons embraced it. always accessible and present. then in early 2014 just months after that thanks giving appearance, simmons suddenly vanished behind the walls of his home. fans asked why and conspiracies swirled. >> let's discuss the two main theories at that time. >> reporter: now three years later, simmons still out of the spotlight and his disappearance from public life is the subject of the number one pod cast, missing richard simmons. >> three years ago to the day richard simmons stopped being richard simmons. i want to find out why. >> i met him in 2012. i wanted to tell his story before this happened. the fact that he disappeared like he did? just kind of made it more urgent. >> reporter: a one time producer for the daily show, one of many who was hooked on the simmons workout, payment friends with the fun-loving fitne