Oksana Grigorieva Under Investigation for Extortion 4.26K Adrian Chen 07/21/10 09:56PM Filed to: Investigations Investigations Oksana grigorieva Mel Gibson Extortion Gettypic Oksana Grigorieva is being investigated for potentially extorting Mel Gibson with recordings of his racist rantings. No other details have emerged. But how could you extort someone using things that are literally priceless? [NYDN, photo via Getty]