3. Judias Buenoano
Judias or ‘Judy’ Buenoano’s plan was simple yet very sinister. Kill and cash the insurance. By the time she was caught by the police, she had killed her husband James Goodyear by slowly poisoning him. She also poisoned her paraplegic son Michael Buenoano, who she took out on a canoe and let him drown after it tipped over.
She had also tried killing her then-boyfriend John Gentry by trying to blow up his car, with him sitting inside it. She was the second woman in the US to be executed by an electric chair in 1998.