Oksana Grigorieva recorded Mel Gibson's threatening rants for proof

Mel Gibson's ex-lover Oksana Grigorieva recorded the actor's threatening rants because she thought he would kill her and she wanted her mother to have proof, it has emerged.

The singer made the confession in a tell-all interview with Larry King.

"I started taping it around 11 o'clock because I thought I'm actually not going to live through the night," TMZ quoted her as saying.

"I wanted my mother to be able to prove that if I'm dead that this is who did it," she added.