Mel Gibson and his ex-girlfriend

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Mel Gibson, under investigation for domestic violence, admits to hitting Oksana Grigorievaand TWICE threatens to kill her in an explosive new audio tape obtained and released exclusively by RadarOnline.com.

In the newest leaked recording, obtained by RadarOnline.com, Gibson not only admits to hitting the mother of his 8-month-old daughter Lucia, he also threatens -girlfriend Oksana Grig

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