ABC News reports...

Eccentric fitness guru Richard Simmons, known for his unrelenting positivity, has died, according to his representative.

Simmons just celebrated his 76th birthday on Friday.

The Los Angeles Police Department responded to his home after a 911 call from his housekeeper and found Simmons dead, according to police sources. He appears to have died of natural causes, and no foul play is suspected, the sources said.

Simmons had spooked fans just three months ago when he posted that he was dying on Facebook, writing in March, "I have some news to tell you. Please don’t be sad. I am .... dying. Oh I can see your faces now. The truth is we all are dying. Every day we live we are getting closer to our death."

He later clarified that he was not actually dying, but that the message was intended to encourage everyone to "embrace every day that we have."