Mark, a twice-convicted sex offender, says he’s not guilty of the crimes for which he’s been convicted. He says he took a plea deal when he was 19, that sent him to prison for seven years, because his mom told him to do so. But he says he didn’t know the terms or understand what he was agreeing to.

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In the video above, Dr. Phil questions Mark about the circumstances surrounding the offenses. How does he explain his behavior?

WATCH: Why Mom Defends Sex Offender Boyfriend

On Wednesday's episode, hear from Mark’s current girlfriend, Arlene, who says she believes Mark is innocent of the crimes and is so certain, she had no problem moving him into the house she shared with her 16-year-old daughter. Check here to see where you can watch.

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Woman Who Defends Sex Offender Boyfriend Hears His Confession – Will She Still Stand By Him?