Edgar Tamayo, the Houston cop killer whose case rallied advocates from Mexico to Washington, D.C., went to his death without a word Wednesday in the state's Huntsville death house, the Houston Chronicle reports.

Tamayo, 46, was condemned for the January 1994 murder of Houston police officer Guy Gaddis, 24. Tamayo, who had been imprisoned in California for aggravated robbery, shot the officer three times with a pistol hidden in his clothing as he was being taken to jail.

The execution was delayed three hours as the U.S. Supreme Court considered whether to take up his final appeals based on mental retardation and the violation of his United Nations treaty rights to contact his consulate.

After the execution, members of the Gaddis family addressed the media. As reporters waited for them to take the stand, representatives of the Mexican government expressed support for the killer's family and decried the execution.