Charlie Sheen filed a lawsuit Monday for extortion and two other counts against the porn star who claims he tried to choke her during a bizarre meltdown in a New York hotel last month.

In the lawsuit, which you can read here on RadarOnline.com, Sheen alleges that Christina Walsh, aka Capri Anderson, demanded $1 million from the Two and a Half Men star to keep quiet.  The suit also alleges that Walsh works as a prostitute.

DOCUMENTS: Read Charlie Sheen’s Lawsuit Against Porn Star

Sheen’s lawsuit was filed by L.A. power attorney Marty Singer and says Walsh engaged in  "an attempted shakedown and extortion of the internationally known actor and celebrity Charlie Sheen."

She is described as "an opportunistic pornographic film star and publicity hungry scam artist".

PHOTOS: Capri Anderson’s Sexy Poses

Sheen’s suit, filed in Los Angeles, adds another dimension to a tumultuous day that included Walsh appearing on ABC’s Good Morning America and alleging that Sheen threw a lamp at her, used racial slurs, snorted a white powder and generally went out of control, including putting his hands on her neck. Walsh also filed a complaint with New York police and announced she is suing Sheen. She appeared with her lawyer who confirmed the lawsuit against Sheen would charge battery and false imprisonment.

But Sheen’s suit contains explosive allegations against Walsh and her attorney. The lawsuit reads that  "after a consensual encounter with Sheen in the Plaza Hotel on the evening of October 25, 2010 Walsh decided this was her chance to become rich and famous."

His lawsuit suit claims Anderson "fabricated a sensational tale about being assaulted battered and held against her will and used that fictional story as a basis for an extortion plot against Sheen, threatening that if he did not pay her at least one million dollars she would go to (i) the Aspen District Attorney with her false allegations and (ii) seek to embarrass him and attempt to damage his career by going to the media with her false tale."

Walsh contacted the Aspen District Attorney, according to Sheen’s suit. Sheen was on probation in Colorado stemming from his Christmas arrest on domestic violence charges against then-wife Brooke Mueller. The DA took no action.

But Walsh told others that she was not “assaulted, battered or held against her will,” by Sheen, the lawsuit alleges and that Sheen acted like a “total gentleman.”

When the Aspen DA took no action against Sheen, Walsh lowered her demand to $500,000 and her attorney contacted Sheen’s lawyer. “Sheen intends to expose Walsh for the fraud she is,” the suit says.

Sheen’s lawyer held nothing back in the suit, charging: “Though Walsh was working in the pornographic film industry in Los Angeles the past several years, Plaintiff is informed and believes and based thereon alleges that Walsh had fallen on hard financial times and recently started earning money as an escort and a prostitute in New York.”

The actor also charges Walsh with stealing his $165,000 Patek Phiippe watch and giving it to someone else to hold. As for Walsh locking herself in the bathroom, Sheen’s side is “Walsh was the one who locked herself in the bathroom and refused to come out apparently because she was afraid Sheen might find the watch on her.”

Walsh retained an attorney the day after the hotel incident, according to Sheen’s suit and on October 28 that lawyer contacted Sheen’s attorney to discuss an “urgent matter. During a subsequent conversation Walsh’s attorney asked for $1 million and said Walsh was going to contact the Aspen DA and go on national TV “unless Sheen paid her.”

Her attorney said Walsh could be persuaded not to contact the Aspen DA or go on TV in exchange for money, Sheen’s suit charges. Her attorney contacted Sheen’s lawyer again on November 19 and said that Walsh was going to conduct an interview with Good Morning America on November 20 and level charges of asault, false imprisonment and battery against Sheen. The lawyer said she would drop those plans for $500,000 according to Sheen’s suit.

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Anderson said she had been hired for $3500 to join Sheen for dinner on October 25.

She called "absolutely untrue" reports that she expected to be paid for sex.

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In response, Sheen wants compensation for the $165,000 diamond encrusted watch he claims Anderson stole -- and damages.

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Capri Anderson - the porn star who said Charlie Sheen tried to strangle her -- has filed a formal criminal complaint with the New York Police Department, RadarOnline.com has confirmed.

"Capri met with detectives this morning and discussed her version of events about the night of the alleged attack," a source with knowledge of the situation told RadarOnline.com.

PHOTOS: Capri Anderson’s Sexy Poses

Anderson, aka Christina Walsh, handed over to police photographic evidence of a purse she claims the Two and a Half Men actor destroyed during his cocaine fuelled tantrum, the source added.

Investigators also want to speak to Sheen about claims Capri stole his $170,000 diamond encrusted watch.

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"The investigators want to talk to Charlie about that night, as well as (ex-wife) Denise Richards because she was an eyewitness to events earlier in the evening," the law enforcement source said.

In an interview aired Monday, Anderson claimed she was sitting on a coffee table in Sheen's New York hotel room when the star began "snorting a white powdery substance".

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Despite her own secret drug past, Anderson has denied she too used drugs on the fateful night at the centre of the criminal investigation.

"The allegation that Capri Anderson did cocaine that night is ridiculous and false," her lawyer, Keith Davidson, told RadarOnline.com.

"It's as preposterous as Charlie's watch being stolen, and his allergic reaction that caused him to be hospitalized. Its another smear attempt by Charlie Sheen's camp."

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In a statement to RadarOnline.com, Sheen's lawyer Yale Galanter dismissed Anderson's move, as an attempt to cash in on Sheen's celebrity.

"Ms. Capri never made any allegation to the police of any wrongful conduct on the part of Mr.Sheen the night of the incident and she had every opportunity to do so," he said.

"If she pursues legal action, we will defend this vigorously."

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