Could Shocking Audio Tapes Incriminate Mel Gibson?

An explosive new audio tape of a man purported to be Mel Gibson lashing out in a verbal tirade against his ex girlfriend and mother of his child, Oksana Grigorieva, has surfaced as the star is under investigation by the L.A. Sheriff's Department for domestic violence.

According to RadarOnline.com, the man purported to be Gibson on the tape admits to hitting the woman heard on the recording (said to be Grigorieva) and twice threatens to kill her; after she says he hit her and broke her teeth, he replies, "You deserved it."

The recording contains graphic and profane language, and at one point the man says the woman needs a "bat to the side of the head" after she responds to his rant with, "You're unbalanced. You need medication."