The scheduled execution next month in Texas of a Mexican national threatens to damage relations between the U.S. and Mexico and complicate U.S. ability to help Americans detained overseas, Secretary of State John Kerry warned Texas officials, says the New York Times. The Mexican, Edgar Arias Tamayo, 46, was convicted of shooting and killing a Houston police officer who was taking him to jail after a robbery in 1994. Tamayo, who was in the nation illegally, was not notified of his right to contact the Mexican Consulate, in violation of an international treaty. Despite Kerry's involvement, there is no sign Texas officials plan to delay the execution. In 2004, the United Nations’ International Court of Justice ordered the U.S. to review the convictions of Tamayo and 50 other Mexican nationals under U.S. death sentences whose Vienna Convention rights, it said, were violated.