Fitness legend Richard Simmons dead at 76

• Fitness guru Richard Simmons died on Saturday, one day after his 76th birthday.
• TMZ first reported that law enforcement said he passed naturally, with no foul play suspected.
• Simmons was known for his energetic personality and weight-loss videos.

Richard Simmons, the iconic fitness personality, has died at the age of 76.

TMZ first reported the news, indicating that no foul play was suspected. Law enforcement sources told the outlet his passing was being investigated as a natural death. ABC News later confirmed the report, citing Simmons' representative.

Simmons found fame in the 1980s for his energetic aerobic videos like "Sweatin' to the Oldies" and his Emmy-winning daytime show, "The Richard Simmons Show."

His flamboyant personality made him a fixture on game shows and late-night talk shows.

Simmons had not been seen publicly since 2014, leading to concerns about his well-being. However, in 2016, Simmons spoke to "Today" host Savannah Guthrie over the phone and assured the public he was fine and just wanted to leave the public eye.

In March, Simmons revealed on his Facebook page that he had skin cancer.

This is a developing story. Please check back for updates.