HUNTSVILLE, Texas — Texas Gov. Greg Abbott on Thursday spared the life of a convicted killer shortly before the man's scheduled execution for masterminding the fatal shootings of his mother and brother.

In sparing the life of Thomas "Bart" Whitaker, Abbott accepted the state parole board's rare clemency recommendation. Whitaker's father, Kent, also was shot in the 2003 plot at the family's suburban Houston home but survived and led the effort to save his son from execution. Abbott commuted the sentence to life without parole.

"I'm thankful not for me but for my dad," Bart Whitaker said in a statement to prison officials. "Any punishment that I would have or will receive is just, but my dad did nothing wrong. The system worked for him today. And I will do my best to uphold my role in the system."

The seven-member Texas Board of Pardons and Paroles, whose members are appointed by the governor, recommended unanimously Tuesday that Abbott commute the sentence. Abbott, a Republican had the option of accepting the recommendation, rejecting it or doing nothing.

"Mr. Whitaker's father, who survived the attempt on his life, passionately opposes the execution of his son. Mr. Whitaker's father insists that he would be victimized again if the state put to death his last remaining immediate family member," Abbott said in a proclamation issued Thursday evening, adding that Whitaker had also agreed to waive all further rights to parole.

Abbott added: "The totality of these factors warrants a commutation of Mr. Whitaker's death sentence to life in prison without the possibility of parole."

It was only the fourth time since the state resumed executions in 1982 that the parole board has recommended clemency within days of an inmate's scheduled execution. In the previous cases, then-Gov. Rick Perry, also a Republican, accepted the board's decision in one case and rejected the other two, who subsequently were put to death in the nation's most active capital punishment state.

Executions were also scheduled to take place Thursday in Florida and Alabama. If all three were carried out, it would have marked the first time in more than eight years that three convicted killers were put to death in the U.S. on the same day.

Kent and Patricia Whitaker and their two boys had returned home the night of Dec. 10, 2003, following a restaurant dinner to celebrate Bart Whitaker's college graduation when they were confronted by a gunman wearing dark clothes and a ski mask. Patricia Whitaker and her 19-year-old son, Kevin, were killed. Kent Whitaker and Bart were wounded.

Nearly two years later, Bart Whitaker was arrested in Mexico after investigators determined he arranged the plot in hopes of collecting a family estate he believed was worth more than $1 million.

"I'm 100 percent guilty," Whitaker testified at his trial in 2007. "I put the plan in motion."

He hated his parents and brother at the time, he said.

Whitaker's father said he loves and has forgiven his son, calling him a changed person.

"As the greatest victim in this case, you don't have to convince me how awful this crime was," Kent Whitaker said.

Evidence showed the plot included two of Bart Whitaker's friends and was at least his third attempt to kill his family. Whitaker's wound to his arm was meant to draw attention away from his involvement. Unknown to his parents, the dinner celebration marking his graduation was a fraud. He'd dropped out of school months earlier.

The gunman, Chris Brashear, pleaded guilty in 2007 to a murder charge and is serving life in prison. Steve Champagne, who drove Brashear from the Whitaker house the night of the shootings, took a 15-year prison term in exchange for testifying at Whitaker's trial.