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HOUSTON (KIAH) — Carl Wayne Buntion, who murdered Houston police officer James Irby during a 1990 traffic stop, is scheduled to be executed on April 21, Harris County District Attorney Kim Ogg announced Tuesday.

The date was set by a judge at the request of prosecutors during a hearing at the Criminal Justice Center.

“He shot a policeman in the head more than 30 years ago, and it is time that he be held accountable for his horrific crime,” Ogg said in a statement. “He robbed Officer Irby of his life and deprived the Irby family of a lifetime of memories with him; it is time for them to have justice.”

According to the case, Buntion was a passenger in a car pulled over by Irby at Airline Drive and Lyerly Street on June 27, 1990. While Irby and the driver were talking, Buntion slipped out of the vehicle and shot Irby once in the head. While Irby was lying on the ground, Buntion shot him twice in the back. He ran away and fired at others before being caught in a nearby building.

In 1991, a jury found Buntion guilty of capital murder and sentenced him to death.  He was later granted a second trial and was again convicted in 2012 and again sentenced to death.

Buntion, was a member of the Aryan Brotherhood of Texas prison gang. Prior to the capital murder, he had an extensive criminal record, including 13 prior felony convictions.