With his back turned and writing on a piece of paper, security guard Brian Williams never saw Gayland Bradford come up behind him at a Dallas grocery store.
As seen on a surveillance video, Bradford pulls a pistol, says nothing and without warning shoots the 29-year-old Williams in the back. He fires three more times at the mortally wounded Williams, then yells for a companion who joins him in trying to take cash from a register.
They left with $7 taken from Williams, who died about an hour later.
Bradford is set for lethal injection Wednesday evening in Huntsville for the December 1988 slaying.
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The U.S. Supreme Court last week refused to reconsider his appeals, clearing the way for him to become the fourth Texas inmate executed this year.