Richard Simmons was reportedly taken to a hospital in Los Angeles on Friday.
The Los Angeles Fire Department confirmed to ET that they responded to a call at 11:52 p.m. at the 67-year-old fitness guru's home. One person was transported to the hospital via ambulance.
While the LAFD did not confirm if it was Simmons who was transported, TMZ reports that it was him after he was "exhibiting bizarre conduct."
See more images of Richard Simmons through the years:
Sources told TMZ that Simmons was acting in an unusually strange manner, which resulted in someone inside his residence calling 911. They had not confirmed if Simmons was still hospitalized.
ET has reached out to Richard Simmons' reps for comment.
In March, ET spoke with Simmons over the phone, and he explained why he had not been seen in the public in more than two years.
"I am not kidnapped," he told ET's Brad Bessey. "I am just in my house right now."
"No one should be worried about me," Simmons added. "The people that surround me are wonderful people who take great care of me."
The conversation occurred one day after the New York Daily News published a "very hurtful" article about the Sweatin' to the Oldies creator, claiming he was "being held against his will inside his Hollywood Hills mansion" and that his former friends had become concerned. His last public appearance was on December 13, 2013, at SPARKLE: An All-Star Holiday Concert at L.A.'s ACME Comedy.
"I love all the people who worry about me. But it was time for me to take some time to be by myself," Simmons said. "For the last 40 years I have been traveling, teaching classes, and I had a knee injury, so I had a knee replacement, which was very difficult for me. I have really just been taking it easy, staying at home, working out in my gym and doing the things I haven't done in a very long time."
Simmons explained that this is how he wants to live his life right now, urging people to not worry about him. "If I was in any trouble, if I was hurting in any way, I would reach out," he assured ET. "It is time right now for Richard Simmons to take care of Richard Simmons."
To hear more, watch the video above.