Wife's Years of Alleged Abuse a Motive for Murder Plot?

Amy Bessey told "20/20" she had nothing to do with her estranged husband Robert Bessey getting shot.
3:00 | 03/28/14

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Transcript for Wife's Years of Alleged Abuse a Motive for Murder Plot?
Police are now exploring a new theory. That Roberts estranged wife hated him enough to have plotted his murder with Michael and -- -- Rick. But -- insisted to police she had nothing to do with. Class in digital -- Her alibi that she was at that spaghetti dinner at her sister's house the night before. Then went home and was asleep in bed when the crime occur from sitting here today you can say you had absolutely nothing to do with that shooting. Positively. -- -- Nothing but anyway she says that she really wanted her husband dead she -- shot him in self defense when he got violent for. Over fifteen years I slept with a shotgun at the end of my bed. I slept with my -- next to my head with Robert beating the crap out of me I'm bloody I know the laws that would have been right to ship. A month after Michael's arrest -- is still in the family home with their kids being a multi. That's when a bomb shell explodes in the district attorney's office. We had in jail house informant sent a letter actually to -- to -- Michael has been spilling his guts to a snitch from. -- mommy had murder on her mind. -- -- written a letter or. A number of details that he provided among those details that Amy had been applauding Robert's murder for months. Robert and -- had big blowout the jobs on the whole divorce proceedings. I think that's when she started to plot has. But prosecutors don't think -- motive was her safety. Robert had already moved out of the house and was keeping his distance know they say it's something much simpler something folks in Vegas would understand. -- -- She's with the beneficiary of his life insurance goals and that life insurance policy was worth 250000. Dollars.

This transcript has been automatically generated and may not be 100% accurate.

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