The man known as the 'ninja killer' is set to be executed over killing a couple visiting the US state of Florida.
This comes as Florida Republican Governor Ron DeSantis ramps up executions in the 'Sunshine State'.
Louis Bernard Gaskin, 56, is scheduled to be executed by lethal injection at 6 pm local time (11pm GMT).
He was convicted of killing Robert Sturmfels, 56, and Georgette Sturmfels, 55, on December 20, 1989, in their Flagler County winter home on Florida's northeast coast. The couple had been visiting from New Jersey.
Gaskin gained his grim nickname by wearing all-black ninja clothing during the crimes. He shot his victims with a .22-caliber rifle.
He claimed that night "the devil had more of a hold than God did".
Property that he stole from the Sturmfels' home - a clock, two lamps and a videocassette recorder - was found at his residence and were intended to be Christmas gifts for his girlfriend, according to investigators.
He was also convicted of armed robbery, burglary and the attempted murder of another couple who lived nearby that same night.
"The guilt was always there," Gaskin said. "The devil had more of a hold than God did. I knew that I was wrong. I wasn't insane."
Local media reported at the time that Gaskin quickly confessed to the crimes and told a psychologist before his trial that he knew what he was doing.
Jurors voted 8-4 in 1990 to recommend the death sentence, which the judge accepted. Florida law now requires a unanimous jury vote for capital punishment, although the Legislature could send Mr DeSantis a bill this week that would allow 8-4 jury recommendations for capital punishment.
The state and US supreme courts have rejected appeals Gaskin filed since his death warrant was signed, with the latest denial coming Tuesday.
It will be the state's 100th execution since the reinstatement of the death penalty in 1976. There are another 297 people on Florida's death row.
Mr DeSantis has been signing death warrants at a rapid pace this year as he prepares his widely expected presidential campaign. He only oversaw two executions in his first four years in office, both in 2019.
This execution comes six weeks after Donald Dillbeck, 59, was put to death for the 1990 murder of Faye Vann, 44, in Tallahassee, and three weeks before the scheduled execution of Darryl B. Barwick for slaying Rebecca Wendt, 24, in 1986 in Panama City.
Barring any stays for Gaskin and Barwick, it will be the shortest period three executions have been carried out in Florida since three condemned prisoners were put to death within 36 days in 2014 under then Republican Gov. Rick Scott.
