Texas' 12th Execution Scheduled for Tomorrow

San Antonio street gang member Frank Garcia knew what he was doing when he opened fire on veteran police Sgt. Hector Garza.

Garcia told detectives after he was arrested for the slaying of the 48-year-old officer in 2001 that he knew officers wore bulletproof vests so he aimed for Garza's head. Garza was shot four times, including one shot to his head and two to his neck, according to the Associated Press.

The 39-year-old Garcia is set for execution tomorrow in the death house at Huntsville, Texas. His wife also was killed in the same shooting outburst during a domestic dispute.

He would be the 12th convicted killer put to death this year in Texas, the 39th execution nationwide.