Mel Gibson's Ex Claims He Hit Their Baby On Latest Tape

'No one will believe you,' he tells Oksana Grigorieva.

Radar Online's slow leak of shocking Mel Gibson tapes continued Tuesday (July 20) with a bombshell recording that the gossip site claimed in a headline "could destroy Mel."

The latest snippet of tape is from yet another argument between Gibson and his ex-girlfriend, Oksana Grigorieva, and it appears to provide further evidence that the "Braveheart" actor was physically abusive, as Grigorieva has alleged. (Warning: recording contains violent, harsh language.)

"You hit me, and you hit her [the couple's 9-month old daughter] while she was in my hands! Mel, you're losing your mind. You need medication," Oksana says to Gibson on the nearly five-minute recording, during which she repeatedly questions his mental state. While it has not been independently verified that the voices on the tapes are Gibson and Grigorieva, a spokesperson for the actor has not denied that his client is heard breathlessly screaming obscenities and hurling racial and sexist epithets at his ex on the recordings. Gibson has not made a statement on the tapes, and his spokesperson has offered a "no comment."

After the accusation from Grigorieva, Gibson snaps back, "I want my child, and no one will believe you." This latest shocker comes on top of a previous recording in which Gibson threatened Grigorieva and told her that she "f---ing deserved it" when she complained that he'd hit her.

The Los Angeles Sheriff's Department has opened a domestic-violence investigation involving Gibson and Grigorieva, and Gibson's attorneys are reportedly expected to speak with officials this week about the case. The couple, in the midst of a nasty custody battle over their daughter, are also the subjects of an investigation by the Department of Children and Family services, according to Radar.

Radar editor David Perel recently said on the "Howard Stern Show" that his site has obtained more than 30 minutes of recordings made by Grigorieva following an incident on January 6 in which she has alleged that Gibson punched her in the face and damaged two of her teeth. The site has reported that Grigorieva told law-enforcement authorities that she was holding their daughter — who was 2 months old at the time — when Gibson allegedly struck her. Grigorieva has also claimed that she has a photo of the child with a bruise on her face after the incident.

On the tape, after Grigorieva accuses Gibson of hitting her while she was holding the baby, he erupts in one of his by-now-familiar rages, screaming, "You need a f---ing kick up the ass for being a bitch, cu--, gold-digging whore! With a p---y son! And I want my child, and no one will believe you! So f--- you!" Gibson's wife of 27 years filed for divorce from the actor last year and reportedly spoke out in his defense last week, saying that the director of "The Passion of the Christ" was never violent toward her or their seven children and was a "wonderful father."

After Gibson and Grigorieva — who reportedly dated for three years — argue about the money he has given her to launch a musical career, he mocks her for raising her voice at him on the new tape and eventually loses it again when she claims she signed a separation agreement and does not want any more of his money.

As he loses control once again, Gibson yells at her, "I'm not giving you my house, and you can rot. ... You f---ing offend my f---ing maleness, my masculinity, my being, my soul!"

In previous tapes, Gibson has threatened to burn down Grigorieva's house and makes what appear to be threats on her life. Grigorieva has claimed she made the recordings of Gibson because he allegedly threatened her life.