Fitness guru Richard Simmons died Saturday at the age of 76, his representative and law enforcement sources confirmed to multiple media outlets. Simmons had just celebrated his birthday on Friday and had posted a thank you on social media for all of the messages, less than 24 hours before his death. "Thank you…I never got so many messages about my birthday in my life! I am sitting here writing emails. Have a most beautiful rest of your Friday," Simmons wrote in a social media post Friday afternoon. TMZ, which was first to report on Simmons's death, said emergency crews responded to a call from a housekeeper Saturday morning and pronounced him dead at the scene. According to the outlet, no foul play is suspected. Law enforcement sources confirmed to NBC News that Simmons was found unresponsive Saturday at his Hollywood Hills home. A representative for Simmons confirmed the fitness icon's death to ABC News. Video source: CNN READ MORE: https://www.9news.com/article/news/nation-world/fitness-guru-richard-simmons-dead/507-1963563c-d5c0-44e9-8ffe-b76d04909118 More local videos here: https://bit.ly/2Pa0d1l Subscribe to NEXT: http://bit.ly/2eP1GwI Stay connected: 9NEWS Website: http://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.