The Los Angeles police threat management unit has launched an investigation into Charlie Sheen.

Charlie Sheen

Charlie Sheen

Charlie's former fiancée Brett Rossi was recently granted a temporary restraining order against the actor amid claims he allegedly threatened to pay $20,000 to have her "head kicked in" and now the LAPD have launched their investigation.

Last month the National Enquirer and Radar Online published excerpts of a tape on which Charlie can allegedly be heard making the threats and on Tuesday (06.06.16), the LAPD served a search warrant at American Media Inc's New York headquarters in order to access the audio.

They also confirmed to NBC News that Charlie is now the subject of a "felony threat investigation".

However, American Media Inc., said that the warrant "violates federal and state law prohibiting the use of search warrants against media companies who are reporting news and information".

Brett - real name is Scottine Ross - filed a $5 million lawsuit against Charlie last year after he allegedly failed to tell her he was HIV positive until after they had engaged in unprotected sex five times and she found his medication.

She also claimed the actor, whom she dated from 2013 until 2014 and had a brief engagement with, had forced her to have an abortion and was physically abusive towards her.

Charlie has denied all of the allegations and reportedly refused to settle the suit out of court with her for $1 million.

Last November - one month before Brett filed the lawsuit - Charlie announced he had HIV via a live TV interview on the 'Today' show with NBC host Matt Lauer.

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