When Kathleen Peterson’s bloody body was found at the bottom of a staircase in her home, her husband, Michael, said he believed she had fallen. There was a great amount of blood on the staircase and splattered on the walls. Peterson, who was convicted of murder and sentenced to life in prison but was set free after eight years, maintains he had nothing to do with her death.

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On Tuesday’s episode of Dr. Phil, Dr. Phil asks Peterson, “Did you kill your wife?” Hear his response in the video above. And, hear about an unusual theory including an owl that some believe may explain how Kathleen died.

WATCH: Did Michael Peterson Murder His Wife And Try To Make It Look Like An Accident?

On Tuesday, Peterson explains why he took a plea agreement even though he maintains his innocence. Check here to see where you can watch.

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