Mel Gibson, under investigation for domestic violence, admits to hitting Oksana Grigorieva and TWICE threatens to kill her in an explosive new audio tape obtained and released exclusively by RadarOnline.com. The enraged actor tells the mother of his eight-month old daughter Lucia “you deserved it” after she says that he hit her and broke her teeth. Mel’s stunning admission could be a powerful piece of evidence against him in the criminal investigation that is headed for the district attorney’s office and right now being conducted by the L.A. County Sheriff’s Department. The new tape features a ranting, out-of-control, Mel who...