Oksana Grigorieva's $15M Tape-Destruction Promise To Mel Gibson

09/24/2010 11:34 am ET | Updated May 25, 2011

There is no question ... when Oksana Grigorieva signed an agreement with Mel Gibson last May ... she got millions out of him and only gave one thing in return -- a promise to destroy "evidence," including the secret tapes.

The document obtained by TMZ -- and now at the heart of the L.A. County Sheriff's Department investigation into Mel's extortion claims -- was signed by both Mel and Oksana on May 16, after a 2-day mediation.

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