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 ... receiving notices from Mr. Simmons’ representatives but continued to republish the defamatory sex change allegations without further investigation into Mr. Oliviera’s ...

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 ...

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 ...