Is Oksana Grigorieva Trying to Extort Money From Mel Gibson?

July 21, 2010 — -- The tables might be turning in Mel Gibson's ongoing battle with ex-girlfriend Oksana Grigorieva

The Los Angeles Sheriff's Department is looking into whether Grigorieva may have tried to extort money from Gibson in connection with audio recordings of their arguments leaked online and her allegations of domestic abuse, department spokesman Steve Whitmore told reporters today. He declined to comment further on the nature of the investigation.

Detectives obtained the recordings in a closed-door family court session last week. Gibson and Grigorieva currently are battling for custody of their 8-month-old daughter, Lucia.

Yet another tape leaked online Tuesday. In it, Grigorieva accuses Gibson of hitting her and Lucia, who she was holding in her arms.

The tape is the sixth recording purportedly of the actor's expletive-laced, ranting phone calls with Grigorieva that have been posted by RadarOnline.

In response to Grigorieva's allegations that he hit her and that he is mentally unbalanced, a man, presumably Gibson, replies, "No one will believe you."

"You hit me, and you hit her while she was in my hands! Mel, you're losing your mind. You need medication," Grigorieva tells him in the new excerpt.

When the man claims that she has used him for money, Grigorieva maintains that she signed a document giving up her claim to his fortune.

As in one of the earlier tapes, the man presumed to be Gibson tells her she will be raped because of her promiscuous appearance.

"If you get raped it's your fault, for starters," the man says. "Showing off your fake t**s! Like they're some special deal? How much did they cost, those fakers?"

The sixth tape was the latest salvo in the Mel Gibson saga. Last week, lawyers for the actor and Grigorieva faced off in family court.