Purdie Guerra Clark is speaking out from a Texas prison 17 years after pleading guilty to fatally poisoning her boyfriend. Snapped: Behind Bars airs Sundays at 6/5c on Oxygen.Catch up on the Oxygen ...

Then, her carefully crafted alibi fell apart, exposing her as a manipulative and calculated killer. Hoffman proved she would stop at nothing to get what she wanted—even if it meant taking a life—in a ...