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DID A WOMAN SUSPECTED OF POISONING HER TWO HUSBANDS TRY TO PIN THE MURDERS ON HER OWN DAUGHTER?

"Black Widow" Murder Trial Pit Mother Against Daughter -- Stacey Castor Accused of Plotting to Murder and Frame Daughter Ashley Wallace

David Muir Reports on Two-Hour "20/20 Saturday," April 18, 8-10 p.m., ET

Two men poisoned by anti-freeze, laid to rest in the same cemetery side-by-side. Was the grieving wife Stacey Castor really a black widow, who murdered both of her husband's just a few years apart? And was this woman so twisted that she poisoned her own daughter, Ashley, to stage it as a suicide and frame her for the heinous crimes? Or was the daughter actually responsible for the men's deaths? ABC News Correspondent David Muir followed the twists and turns of a bizarre mystery that captivated an entire community which played out in an upstate New York courtroom. Who would the jury believe - mother or daughter?

"20/20" was granted full access to all sides of this curious investigation and trial. Muir's interviews included a jailhouse sit-down with suspected murderer Stacey Castor, as well as both of her daughters. He also interviewed lawyers, detectives, family and friends who watched this mystery unravel. The report airs on "20/20 SATURDAY," APRIL 18 (8:00-10:00 p.m., ET) on the ABC Television Network. (OAD: 5/28/10)

"20/20" is anchored by Elizabeth Vargas and David Muir. David Sloan is executive producer.