Longtime "The Price is Right" host Bob Barker died from Alzheimer's disease, according to multiple reports.

The 99-year-old television icon's death certificate listed his cause of death on Aug. 26 as Alzheimer's, Entertainment Tonight, People magazine and ABC7 reported Tuesday.

TMZ was first to report the news.

The document revealed Barker had lived with Alzheimer's for "years," per People. Hypertension, hypothyroidism and hyperlipidemia were listed as contributing factors, according to ET and ABC7.

Barker's publicist Roger Neal confirmed Barker's death to USA TODAY in August, saying in a statement, "It is with profound sadness that we announce that the World’s Greatest MC who ever lived, Bob Barker, has left us."

Guinness World Records twice named Barker TV's Most Durable Performer; he was the face of "The Price is Right" from 1972 to 2007.

Bob Barker promoted vegetarianism as a preventative measure for Alzheimer's

Barker credited his mental and physical health to his decades of vegetarianism in a promotional video he did for PETA in 2013.

"I became a vegetarian more than 30 years ago, and almost immediately felt healthier and I had more energy. But being vegetarian doesn't just help your body; it also helps your mind," he said. "Studies show that the more meat you eat, the greater your risk is of developing Alzheimer's disease."

He ended the video with: "So, to protect your memory, eat vegetarian and keep your wits about you until a ripe old age."

An estimated 6.7 million adults 65 and older in the U.S. are living with Alzheimer's in 2023, with almost two-thirds of them being women, according to the Alzheimer's Association.

CBS honored its former host last week with a primetime special called "The Price is Right: A Tribute to Bob Barker." Drew Carey, who replaced Barker as host of "The Price is Right," emceed the special.

"Very sad day for the Price Is Right family, and animal lovers all over the world," Carey wrote about Barker's death on X, formerly Twitter. "There hasn’t been a day on set that I didn't think of Bob Barker and thank him. I will carry his memory in my heart forever."

Barker won 18 Daytime Emmys, as well as a Daytime Emmy Award for lifetime achievement in 1999. In early 2004, he was inducted into the Television Academy Hall of Fame.

Game show icon Bob Barker,tanned and charming host of 'The Price is Right,' dies at 99

Q&A:Families combating Alzheimer's disease are not alone. What you need to know