Michael Peterson was convicted of murdering his wife, Kathleen, and sentenced to life in prison after her bloody body was found at the bottom of a staircase in their home. Peterson, though, claims he had nothing to do with her death.

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On Monday’s episode of Dr. Phil, Peterson, who was set free in 2017 after eight years behind bars, sat down for a revealing interview. In the video above, get caught up on the mysterious circumstances surrounding Kathleen’s death, why Peterson believes he was convicted, and what police say could have been a motive. And, hear a shocking twist that happened 16 years prior to Kathleen’s death.

WATCH: Why Michael Peterson, Who Insists He Didn’t Kill His Wife, Says He Agreed To Alford Plea Of Voluntary Manslaughter

On Tuesday’s episode, learn about the unusual theory of how some people believe Kathleen may have really died. Check here to see where you can watch.

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Shocking Theory Of How Some Believe Woman Found Bloody At The Bottom Of A Staircase Died