Melissa says she has thought about harming her parents, Donna and Mark Senior, as well as her brother, Mark Junior, for about a year. In May, the 26-year old moved 2,000 miles across the country without telling her family because she says she feared she would act on her urges.

TELL DR. PHIL YOUR STORY: Life in crisis?

“I’m afraid one day I may not be able to control my anger, and I might hurt somebody, or even kill somebody,” says Melissa.

WATCH: ‘I Don’t Want To Be This Monster,’ Says Woman Who Claims She Has ‘Violent Urges’ Toward Her Family

“She’s always been sweet. Kind. She’s never expressed anger,” says Donna. Unaware of their daughter’s unsettling thoughts, Melissa’s parents say they just want to know what’s going on with her and why she moved away without telling them.

Watch part one of this two-part Dr. Phil airing Monday to hear why Melissa says she hates her parents. Then, watch the conclusion on Tuesday to find out how Donna and Mark Senior respond to learning their daughter’s secret.

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TELL DR. PHIL YOUR STORY: At your final breaking point?