Richard Simmons was a television personality and fitness guru for several decades, teaching Americans about a healthy lifestyle. His sudden death is now the subject of an investigation.

Richard Simmons, a famous fitness expert, died on Saturday, July 13, at age 76. The exact cause of his death is still unknown and is being investigated. However, there is no suspicion of foul play.

Fitness guru Richard Simmons’ cause of death is being ‘deferred pending further testing and investigation,’ according to police. ET caught up with friends and family of the late fitness guru ...