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Charlie Sheen could find himself at the wrong end of the law again.

The actor is under criminal investigation by the Los Angeles Police Department, multiple outlets have confirmed. Although details of what exactly happened are scarce, it's believed that the incident is centered around his ex fiance Brett Rossi.

According to People magazine, Los Angeles police received a call on March 31 at 7:45 a.m. for a criminal investigation. The LAPD's threat management unit, which investigates cases involving harassment or stalking, is working on the case.

"Charlie Sheen is listed as a suspect in this investigation," an LAPD spokesperson said. "The victim's information is kept confidential due to the investigation, and the investigation is ongoing at this time."

The timing of the incident points to Brett.

The same day as the incident, the former porn star was granted a seven day restraining order against Charlie, telling police that she is terrified of the actor.

Brett arrived at a Los Angeles police station on March 31 and reported an incident that occurred between the former lovers. Less than 24 hours later, a judge granted the order and even moments after the order, Brett said she was already planned to file an extension to make Charlie keep his distance.

What happened between the two of them isn't known. The two have had a rocky relationship, to say the least.

In December, she filed a lawsuit accusing the actor of assault and battery, emotional distress, false imprisonment and negligence.

Many believed that she was suing him because he allegedly didn't disclose to her that he is HIV positive while continuing to have unprotected sex, but she said in December — a few weeks after his public HIV reveal — that isn't the case. Many believe that a wave of lawsuits could still be coming his way.

Brett's complaint described an allegedly physically and emotionally abusive relationship. But, she said she was too in love with the former "Two and a Half Men" star, and then too afraid, to leave him.

The one-time Hollywood bad boy, who has had no shortage of trouble with the law, has said she's simply trying to extort him with the lawsuit.