Oksana Grigorieva Black Eye Photo Questioned

Oksana Grigorieva's accusations of domestic violence may or may not be backed by witnesses who she says saw the argument in which Mel Gibson hit her.

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February 18: Day of the Mel Gibson Tapes

MAD MEL: Finally, a new theory has emerged as to when the infamous tapes were recorded, and why Mel Gibson flew into a blinding rage at Oksana Grigorieva.

The Mel Gibson tapes are now infamous, but many questions remain, including when they were recorded, and what event(s) sent the actor SO over the edge.

Well, sources tell TMZ that Oksana Grigorieva began secretly taping her ex-boyfriend shortly after he accused her of "messing around with the tree man."

It all went down February 18 - all six Mel Gibson rants leaked so far.

On that date, Oksana went to Mel's house and he allegedly flew into a rage. Sources say that Gibson had quit smoking that day and was in a "terrible mood."

It bears mentioning that reports also say how Mel also tried to quit smoking the day of his alleged attack on Grigorieva and their daughter Lucia, January 6.

On February 18 Mel became insanely jealous, accusing Oksana of an affair with her landscaper. According to Oksana, she left in fear for herself and the baby.

After she left, angry Mel began calling and she began recording.

Sources say there was no physical violence February 18 and the

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Natalie Grigorieva: The Mel Gibson Tape Source?

The now-infamous Mel Gibson tapes are as shocking as anything we've heard ... well, ever. But the mystery surrounding them has become a separate and equally bizarre component in the actor's custody fight with Oksana Grigorieva.

There may finally be an answer to how Gibson's insane rants against Grigorieva were leaked online, something Oksana has denied being responsible for.

Several sources close to the case say Oksana's younger sister, Natalie Grigorieva, is suspected of being Radar Online's mystery Mel Gibson tape source.

Natalie is being investigated by authorities.

"I suspect if the authorities look at the sister, they'll find a wire transfer or a check to her from [Radar]," a source said. "She and Oksana are very close."

Another source claims that Oksana's sister was even involved in shopping the tapes to media outlets before making the sale to the celebrity gossip site.

Did Oksana's sister leak the tapes?

"All the tabloids said no to the deal because they were asked to purchase the [Mel Gibson tapes] before even listening to them," another source said.

If Natalie Grigorieva is found to have brokered a deal at the behest of her sister, it's possible a judge could find the Russian singer in contempt of court.

Oksana Grigorieva, under investigation herself for extortion, also could face charges based on text messages and e-mails she sent to the actor.

In a text message obtained by The Hollywood Reporter, Oksana allegedly wrote Mel that she taped him because "you broke your agreement with me."

The two parties, who share an eight-month-old daughter, had agreed on a $15 million deal over custody and keeping all "evidence" confidential.

But Oksana left it on the table because, she said, it gave Gibson unsupervised visits with their child, and she feared for Lucia's safety around Mel.

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