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John Ruthell Henry

John Ruthell Henry has received a lethal injection at Florida State Prison, becoming the third inmate to be put to death since the botched execution of an Oklahoma prisoner in April set off a flurry of legal challenges.

The Florida governor's office says Henry, 63, was pronounced dead at 7:43 p.m. ET after a last-minute appeal to the U.S. Supreme Court was turned down.

He was convicted of fatally stabbing his wife, Suzanne Henry, and her 5-year-old son in 1985.