Charlie Sheen’s lawyer comes out swinging against CBS, Warner Bros. and Chuck Lorre

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Charlie Sheen is bringing out the legal guns against CBS and Warner Bros. — and he’s also not done with his boss on ‘Two and a Half Men,’ producer Chuck Lorre.

In a five-page demand letter posted by Radaronline.com, Sheen’s attorney Marty Singer, a well-known celebrity lawyer, says his client is sober and ready to work on the show but that CBS and Warner Bros. shut it down last week ‘in retaliation for your show runner (Lorre) being criticized.’ The letter threatens the companies with a lawsuit if Sheen isn’t paid the full amount for his deal that expires in May 2012.

Sheen — whose entry into rehab forced the series into hiatus last month — last week called Lorre ‘a clown’ and a ‘turd’ and has continued assailing his employers in a blizzard of media interviews since.

Singer wrote that his client was simply responding to Lorre’s own put-downs. ‘Mr. Lorre has repeatedly made negative and derogatory comments about our client and harassed Mr. Sheen on the set,’ Singer wrote. The letter also quotes from Lorre’s ‘vanity cards’ at the end of ‘Two and a Half Men’ episodes, which seem to contain messages meant to ridicule Sheen.

Spokesmen for Warner Bros. and CBS confirmed that they received the letter but declined to comment further.

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—Scott Collins (Twitter: @scottcollinsLAT)