William Rousan, 57, who was convicted of killing a farm couple while trying to steal their cows, was declared dead by lethal injection shortly after midnight in Bonne Terre, Missouri, said Mike O'Connell, spokesman for the state's department of public security.
Rousan was sentenced to death for plotting and carrying out the September 1993 murders of Charles Lewis, 67, and his wife Grace, 62. The double murder was not discovered until a year later.
According to the indictment, Rousan took his son Brent and his brother Robert to the Lewis farm to steal a herd of cows. When Charles Lewis spotted them, Brent Rousan killed him with six shots.
In September 1994, police were tipped off by Rousan's brother-in-law, who told them he was involved in the double murder, and by Rousan's sister, who sold the victims' stolen VCR.
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The son of the murdered couple, Michael Lewis, watched Rousan's death by lethal injection, but said he drew "no real satisfaction from Rousan's incarceration or execution, for neither can replace or restore the moments lost with my parents."
He was declared dead at 6:21 pm, the Orlando Sentinel reported.
It added that as a last meal he ate pork chops, sausage gravy, biscuits, German chocolate cake and soda.
Hendrix was sentenced to death in the killing of Elmer Scott, with whom he had previously carried out a burglary. Scott had later testified against Hendrix and pleaded guilty. Hendrix also killed Scott's wife.
The executions were the 18th and 19th performed in the United States this year.