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LOS ANGELES (CNS) – Hollywood party-boy Charlie Sheen said in a national television interview today that he is HIV-positive.

The former “Two and a Half Men” star made the revelation on a “Today” interview with Matt Lauer, saying he was doing it to stop a smear campaign and extortion efforts.

“It’s a hard three letters to absorb. It’s a turning point in one’s life,” the 50-year-old actor said.

“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 me, that threaten the health of so many others that couldn’t be further from the truth,” he said.

Sheen said he was diagnosed roughly four years ago but doesn’t know how

he contracted it.

“It started with what I thought was a series of crushing headaches,” he said. “I thought I had a brain tumor. I thought it was over.”

Sheen said he’s trusted the diagnosis with people he thought he trusted, but some people have extorted “millions” from him to keep the illness a secret.

Sheen, known for his hard-partying ways and dalliances with porn stars and prostitutes, was famously bounced from the cast of “Two and a Half Men” in 2011 following a bout with drugs and alcohol that led to a suspension of filming and a series of angry verbal attacks on show creator Chuck Lorre.

The National Enquirer is expected to publish a story Wednesday reporting that Sheen is HIV-positive and “how television’s one-time highest-paid star potentially spread the devastating virus to dozens of unsuspecting women,” according to the tabloid’s website.

According to the Enquirer, Sheen has begun a regimen of medication and had a “positive” outlook.

The website reported that Sheen has been HIV positive for about a year, but his secret began leaking out among some of his close confidants, then led to threats of lawsuits from past sexual partners.