As expected, Charlie Sheen made a big announcement this morning concerning his health.

According to the 50-year-old actor, he is HIV-positive and has known this for about four years.

He says he doesn’t know how he contracted the virus.

“I’m here to admit that I am in fact HIV-positive,” Sheen told Matt Lauer in an interview on Tuesday’s TODAY show. “And I have to put a stop to this onslaught, this barrage of attacks and of sub-truths and very harmful and mercurial stories that are about the (alleged) threatening the health of so many others, which couldn’t be farther from the truth.”

Sheen’s doctor was with him on set, and he said that Sheen does not have AIDS.

Check out the reveal:

Watch @CharlieSheen reveal his HIV Positive diagnosis to @MLauer: https://t.co/vDa9dJHldR

— TODAY (@TODAYshow) November 17, 2015

Sheen claims that he was extorted for “millions” by people he trusted with the news of his diagnosis, who then demanded large sums of money to keep the information private.

“What people forget is that it’s money taken from my children,” he said. “I trusted them and they were deep in my inner circle, and I thought they could be helpful. My trust turned to their treason.”

“Are you expecting by talking about this to face a barrage of lawsuits?” “I’m sure that’s next.” –@CharlieSheen https://t.co/40lIUP8c63

— TODAY (@TODAYshow) November 17, 2015

Has @CharlieSheen discussed his HIV diagnosis with his family? Here's what he told @MLauer: https://t.co/eshVgBtEZX

— TODAY (@TODAYshow) November 17, 2015

"If there was one guy on this planet to contract this, that’s going to deliver a cure, it’s me.” –@CharlieSheen https://t.co/NYsToEf9X1

— TODAY (@TODAYshow) November 17, 2015

Sheen says one of the goals of going public with his illness is to “release himself from this prison” and stop the payouts.