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11/29/2012 07:37 am ET

'Fatal Vows': Did Woman's Incest Admission Lead To Her Mysterious Death? (VIDEO)

A shocking bombshell may have resulted in the strange death of one woman on "Fatal Vows." Nancy made a decision to try and help her brother at an AA meeting by revealing that they had shared an incestual, sexual past. It may have helped him come to terms with his own demons, but it didn't help her own marriage.

"You don’t want to think about your life partner having had any kind of physical contact like that with a relative," a psychotherapist said of the case.

Not that her husband, Richard, was a saint himself. He went after a younger woman, buying her lavish things and striking up an affair he was so proud of, he bragged about it. But he stayed married to Nancy.

But then, Nancy’s health began to mysteriously deteriorate. Finally, Richard brought her to a hospital, where she died. Medical examiners found arsenic throughout her body, from her liver and lungs to her hair and nails.

See more true cases of "Fatal Vows" every Saturday at 10 p.m. ET on ID.

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