David Pittman, 63, was pronounced dead at 6:12 p.m. EDT following a lethal injection at Florida State Prison near Starke under a death warrant signed by Republican Gov. Ron DeSantis.
DeSantis spokesperson Alex Lanfranconi said the execution was carried out without complications. Pittman’s last words were, “I know you all came to watch an innocent man be murdered by the state of Florida. I am innocent. I didn’t kill anybody. That’s it,” according to Lanfranconi’s statement.
As the drugs were being administered, Pittman took a few deep breaths and then was quiet.
A day earlier, his final appeal was rejected on Tuesday by the U.S. Supreme Court.
So far, two more Florida executions are scheduled for this fall. Victor Tony Jones is set to die on Sept. 30 for the 1990 killings of two people during a robbery and Samuel Lee Smithers is scheduled to be executed on Oct. 14 for the murders of two women in 1996.
Pittman was convicted and sentenced to death in 1991 on three counts of first-degree murder, according to court records. Jurors also found him guilty of arson and grand theft.
Pittman and his wife, Marie, were going through a contentious divorce in May 1990, when the killings occurred, and investigators say he had threatened to harm her family several times.
Trial testimony showed Pittman cut a phone line at the Mulberry, Florida, home of his wife’s parents, Clarence Knowles, 60, and his wife, 50-year-old Barbara Knowles. Pittman stabbed the couple to death as well as their other daughter, 21-year-old Bonnie Knowles. Pittman then set their house on fire and stole Bonnie Knowles’ car, which he also set ablaze. The family was found dead on May 15 of that year.
A witness during his 1991 trial identified Pittman as the person seen running away from the burning car. A jailhouse informant also testified that Pittman had admitted to the killings. Jurors recommended the death penalty on a 9-3 vote.
Pittman’s most recent appeals focused on recent evidence indicating he suffers from intellectual disabilities, including an IQ in the low 70s, that was apparent at the time of the killings. His lawyers had argued that his execution would violate the Constitution’s protection against executing a person with severe mental problems.
Lawyers for the state disagreed, contending it came too late for Pittman to claim mental impairment from years earlier. The Florida Supreme Court, reversing a previous decision, had ruled in 2020 that such claims could not be applied retroactively.
So far 31 people had been executed in the U.S. to date this year, with Florida leading the way on a flurry of death warrants signed by DeSantis, who has signed more warrants than any of his predecessors.
Before Pittman’s death sentence was carried out, the last person executed in Florida was 59-year-old Curtis Windom on Aug. 28, for his conviction in the 1992 murders of his girlfriend, her mother and another man.
Florida conducts all its executions with a three-drug injection - a sedative, a paralytic and a drug that stops the heart, according to the state Department of Corrections.
Pittman becomes the 11th condemned inmate to be put to death this year in Florida and the 118th overall since the state resumed capital punishment on May 25, 2979.
Pittman becomes the 31st condemned inmate to be put to death this year in the USA, and the 1,638th overall since the nation resumed executions on January 17, 1977, after a 4-year moratorium imposed by the US Supreme Court in its June 29, 1972 Furman v. Georgia decision. The Court allowed states to begin executions via its July 2, 1976 Gregg v. Georgia decision.
Source: The Associated Press, Curt Anderson, September 17, 2025
"One is absolutely sickened, not by the crimes that the wicked have committed,
but by the punishments that the good have inflicted."
but by the punishments that the good have inflicted."
— Oscar Wilde
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