 One day after Richard Simmons turned 76 years old and was on social media thanking his fans and claiming he was sitting and writing emails, Simmons was found dead Saturday in his home here in L.A. Police sources tell ABC News there was a 911 call from his housekeeper, and when police and fire responded, Simmons was dead of what appeared to have been natural causes. There were no signs of foul play. Alex Stone, ABC News, Los Angeles.