On June 29, 1993, a 46-year-old insurance broker named Markham Duff-Smith was executed in Texas using lethal injection. He was responsible for the murders of four individuals: Gertrude Duff-Smith Zabolio, Diana Wanstrath, John, and Kevin. Gertrude was Markham’s adoptive mother while Diana was his adoptive sister. Furthermore, John was Diana’s husband and Kevin was Diana and John’s son.
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