Jeffrey Hutchinson, 62, was put to death for the murders of Renee Flaherty, 32, and her children -- Geoffrey, 9, Amanda, 7, and Logan, 4.
He was executed at 8:14 pm local time Thursday (0014 GMT Friday), the Florida Department of Corrections said in a statement.
He then returned home and fatally shot Flaherty and her children with a 12-gauge shotgun.
When sheriff's deputies arrived, they found Hutchinson dazed on the floor of the garage with blood on his clothes and gunshot residue on his hands.
Hutchinson claimed at trial that the murders were carried out by two masked and armed intruders who shot Flaherty and the children and then fled.
The death penalty has been abolished in 23 of the 50 US states, while three others -- California, Oregon and Pennsylvania -- have moratoriums in place.
President Donald Trump is a proponent of capital punishment and, on his first day in office, called for an expansion of its use “for the vilest crimes.”
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