Oksana Grigorieva won't face extortion charge, prosecutors say

(CBS/AP) LOS ANGELES - Prosecutors say they will not charge Mel Gibson's ex-girlfriend with extortion after they found insufficient evidence to prove the allegation by the actor.

The decision was announced Friday, soon after prosecutors filed a misdemeanor battery charge against the Oscar winner, stemming from an argument he had with the Russian musician in January of last year during which he is accused of striking her.

Pictures: Mel Gibson
Read more: Gibson charged with misdemeanor battery

Attorneys for Oksana Grigorieva say she cooperated fully with the investigation into extortion allegations by Gibson.

Attorneys Daniel Horowitz, Ronald Litz and Martin Garbus said in a statement released to The Associated Press that the Russian musician never invoked her Fifth Amendment rights during several interviews with authorities.

Gibson claimed Grigorieva attempted to extort him during custody negotiations involving their infant daughter, Lucia, after their breakup last year.

The attorneys said they would not release any further statements.

A rep for Grigorieva released a statement, obtained by TMZ, that said: "Ms. Grigorieva will now concentrate on co-parenting Lucia, resuming her charitable work for the children of Chernobyl and moving forward with her life."