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.

Richard Simmons’ Cause of Death Being Investigated Richard Simmons Said 'I Know People Miss Me' in Emotional Final Interview 2 Days Before His Death (Exclusive) From the Spotlight to His Quiet ...

Richard Simmons speaks to the audience before the start of a summer salad fashion show at Grand Central Terminal in New York on June 2, 2006. Simmons, a fitness guru who urged the overweight to ...

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 ...