Antifreeze was the preferred weapon for Stacey Castor. She had met her first husband, Michael Wallace, when she was just 17, and they married a few years later and had two daughters. Then, as their marriage crumbled, Wallace started to feel ill, dying in 2000 after a mysterious ailment. His doctors called it a heart attack, but the family was suspicious, at least in hindsight. In 2003, Castor married David Castor. Two years later, Castor called the police saying her suicidal husband had locked himself in the bedroom after an argument and she was concerned. They broke down the door and found David Castor dead with a bottle of antifreeze at his side. Castor buried him next to the body of her first husband in the same upstate New York cemetery. At first they thought suicide, but evidence soon started to mount that Castor had force-fed her husband the poison with a turkey baster. They exhumed Wallace’s body and found evidence of antifreeze poisoning as well.
As the police closed in, Castor panicked and decided to frame her daughter, Ashley Wallace, for the murder. She invited the 20 year old over for a drink, and dosed her with so many pills that she wound up in a coma for 17 hours. While her daughter was unconscious, Castor forged Wallace’s name on a suicide note in which she confessed to killing her father and David Castor. Police didn’t buy it, though, and Castor was arrested for murdering David and attempting to murder Ashley. She was convicted and sentenced to 51 years, but died in prison earlier this year.