A man who orchestrated the brutal murder of a store clerk said he felt his "whole body burning" during his execution yesterday.
Michael Lee Wilson, 38, was the third of three men to be executed for the 1995 murder of 30-year-old co-worker Richard Yost, who was left dying in a pool of blood, beer and milk after the savage attack.
Another man is serving a life sentence.
Speaking before his execution by lethal injection at Oklahoma State Penitentiary, Wilson said: "I love everybody. Free is free. I am going home. I'm ready to go. I love you, world."
Wilson, who was convicted of first-degree murder, asked a prison officer if his microphone was still active and then continued his statement.
"Love my daughters for me. I'm going to miss you always."
After a brief silence, he said: "I feel my whole body burning."
Prison spokesman Jerry Massie said the time of death was 6:06 pm.
The execution was witnessed by Wilson's mother and four other family members, including his sister who sang a hymn.
Yost's family were also present, including his widow, Angela, and his two grown sons, who were two and eight at the time of the killing.
Wilson and his three accomplices waited for customers to leave the QuikTrip store in Tulsa before striking the clerk with an aluminium baseball bat 54 times in 131 seconds.
He put on the victim's uniform and served customers as Yost lay dying in the back of the store.
He also posed as Yost when a security company called to check an alarm after the gang set of an alarm while removing a safe.
The chilling assault was captured on the store's surveillance system which showed Wilson stuffing money into his pockets and recorded the sound of the bat striking Yost as he pleaded for mercy.
Tulsa Assistant District Attorney James D. Dunn said: "The repeated sounds of the baseball bat striking Mr Yost and Mr Yost's screams will never leave my mind."
Police trailed Wilson after he didn't show up for work later that day and stopped all four men in a car about 14 hours after the crime.
They carried multiple rolls of $5 notes and had pairs of Nike Air tennis shoes with the price tags still attached.
In small talk 14 minutes before the assault began, Wilson asked Yost what kind of future he thought he had with the company who said he one day wanted to manage the store.
Wilson laughed at Yost's answer, then replied, "For real?"
Courts previously rejected Wilson's claims that he may have suffered from schizophrenia or had ineffective lawyers.
Prosecutors said the videotape of the crime showed Wilson engaged in "logical, goal-oriented behaviour."
The state Board of Pardon and Parole rejected Wilson's clemency request last month on a 4-1 vote.
Ahead of the hearing, Assistant Attorney General Jennifer Miller told the panel that Wilson knew Yost had to die so he couldn't identify his robbers.
He said: "The defendant planned the murder and ensured its completion as he could pose as the QuikTrip attendant while Mr Yost lay in the cooler dead or dying."
Yost's widow, Pamela Houser-Yost, told the board their two sons missed the love Richard Yost would have given them and urged its members to deny clemency.
Darwin Brown, 32, was executed in January 2009, and Billy Don Alverson, 39, was executed in January 2011.
The fourth defendant, Richard Harjo, who was 16 at the time of the crime and is now 35, was sentenced to life in prison.