Murderer's mistress Amber Frey breaks silence in new documentary

The murder of Laci Peterson - a 27-year-old expectant mom - has been the subject of true for two decades since her husband Scott was found guilty of killing her.

But there was a third person involved in their marriage in 2002 - a woman who became a critical part of detectives' case against keen golfer and

Amber Frey, now 49, was unknowingly Scott's mistress for weeks before Laci - and she cunningly kept her relationship going while helping police nail Scott as the suspect in the.

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