In a restraining order granted Friday and obtained by PEOPLE, Ross, an ex porn star who has worked under the name Brett Rossi, alleges that "Mr. Sheen choked Ms. Ross to the point of almost losing consciousness," and that at one point he "repeatedly kicked Ms. Ross while she was on the ground."
The document goes on to allege that Ross became aware of an audio recording where Sheen allegedly says of her, "This piece of s--- needs to be f---ing buried" and, "Its treason. You know what treason is? It's punishable by death."
The restraining order also claims that Sheen allegedly said on the recording, "I'd rather spend $20,000 to have her head kicked in. Then people will realize, oh, it's dangerous."
The Los Angeles Police Department told PEOPLE Wednesday that it was opening a criminal investigation into Sheen. Though the LAPD declined to name the victim, a source told PEOPLE the investigation was in response to complaints made by Ross.
Ross filed a lawsuit against Sheen last year, alleging in court documents that the actor kept his HIV-positive status from her during their relationship. Ross and Sheen were engaged from November 2013 to October 2014. Ross, 26, also alleged in the complaint that Sheen, 50, threatened her life, and she claimed that he talked about wanting "to murder people he was angry with" and putting a "hit" on her ex-husband.
In an interview with PEOPLE in December, Ross alleged that she was afraid for her life, saying, "I'm scared he wants to kill me."
Sheen and his lawyer Martin D. Singer have denied all of her allegations.
"Charlie Sheen intends to vigorously defend the lawsuit filed by Brett Rossi aka Scottine Ross. Numerous witnesses will dispute each and every claim made by Ms. Rossi," Singer said in a statement after the lawsuit was filed. "We are confident that Mr. Sheen will prevail in this action and also will recover significant damages against her in connection with a pending arbitration that was commenced months ago."