Credit: Jason Merritt/Getty Images

In a panicked 911 call, Charlie Sheen's wife Brooke Mueller tells a dispatcher that the 44-year-old actor -- who was booked Christmas Day for second-degree assault, menacing and criminal mischief -- has a "knife." Pausing occasionally to cry, she says she is "scared" for her life after he "threatened" her. 

She tells the dispatcher that Sheen is "in the back room" with the knife -- which she describes as a "switch blade" -- and fears that he is trying to "sneak out the back" of the house in Aspen. (Listen to the call here.)

"I gotta file this report," Brooke says in the call.

After spending most of his Christmas Day behind bars, Sheen, 44, was released on $8,500 bond late Friday. (A rep for the actor tells, "Do not be misled by appearance.")

Chief Deputy District Attorney Arnold Mordkin said Monday the menacing charge is the most serious; it carries two to eight years in prison and a fine of $2,000 to $500,000.

Prosecutors say they probably won't decide until Sheen's next court appearance Feb. 8 whether to file charges against the actor.

While Mueller, 32, remains in Aspen (she was photographed smiling during an outing Monday), Sheen is back in Los Angeles.

The two welcomed twins, Bob and Max, this year.