Edgar Tamayo, 46, is set to be executed Wednesday for the January 1994 fatal shooting of Houston police officer Guy Gaddis, 24.

Mexican officials and Tamayo's attorneys are working to spare Tamayo, citing a provision of the 1963 Vienna Convention on Consular Relations.

However, the office of Attorney General Greg Abbott and the Harris County district attorney have opposed postponing Tamayo's execution, the first this year in Texas. That's despite efforts by Secretary of State John Kerry to delay the execution, saying it "could impact the way American citizens are treated in other countries."

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