HUNTSVILLE, Texas -- The U.S. Supreme Court has refused to halt the execution of a South Texas street gang member condemned for his involvement in a gang ambush where four women were gunned down 11 years ago.

The high court in a brief ruling rejected Robert Gene Garza's last-ditch appeals Thursday evening while he waited in a cell a few steps from the Texas death chamber.

The 30-year-old Garza argued trial jurors should have been allowed to hear testimony from his mother that he stayed in the Tri-City Bombers gang because he feared retaliation if he quit. He also contended the state should assure him that the lethal pentobarbital to be used in his punishment is chemically effective and obtained legally.

Texas prison officials have said their pentobarbital supply is expiring this month.

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