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| This handout image provided by the Texas Department of Criminal Justice shows Edgar Tamayo. Attorneys for the Mexican national on Texas death row for the slaying of a Houston police officer hoped a civil suit, challenging what they argued is an unfair and secretive clemency process in the nation’s most active capital punishment state would block the inmate’s scheduled execution this week. Tamayo, 46, was set for lethal injection Wednesday evening, Jan. 22, 2014, in Huntsville. | 
HUNTSVILLE, Texas
     (AP) -- The execution of a Mexican national was at least 
temporarily put on hold Wednesday as the U.S. Supreme Court considered 
appeals to keep 46-year-old Edgar Tamayo from the Texas death chamber.
 
Tamayo's
 execution had been scheduled for 6 p.m. CST Wednesday for the slaying 
20 years ago of a Texas police officer, Guy Gaddis, 24. The state still 
could execute Tamayo before midnight if the Supreme Court rules in its 
favor.
 
Texas officials have opposed appeals to
 stop the scheduled lethal injection, despite pleas and diplomatic 
pressure from the Mexican government and the U.S. State Department.
 
Tamayo's
 attorneys and the Mexican government contend Tamayo's case was tainted 
because he wasn't advised under an international agreement that he could
 get legal help from his home nation after his arrest. 
Legal assistance 
guaranteed under that treaty could have uncovered evidence to contest 
the capital murder charge or provide evidence to keep Tamayo off death 
row, Mexican officials have said.
 
Records show the consulate became involved or aware of the case just as his trial was to begin.
 
Secretary
 of State John Kerry previously asked Texas Attorney General Greg Abbott
 to delay Tamayo's punishment, saying it "could impact the way American 
citizens are treated in other countries." The State Department repeated 
that stance Wednesday.
 
But Abbott's office and
 the Harris County district attorney opposed postponing what would be 
the first execution this year in the nation's most active capital 
punishment state, where 16 people were put to death in 2013.
 
The
 high court was considering at least two appeals. One focused on the 
consular issue. The other was related to whether Tamayo was mentally 
impaired and ineligible for the death penalty. The execution warrant 
remains in effect until midnight.
 
Tamayo's 
lawyers went to the Supreme Court after the 5th U.S. Circuit Court of 
Appeals said an appeal this week renewing an earlier contention that 
Tamayo was mentally impaired and ineligible for execution was filed too 
late.
 
The Texas Board of Pardons and Paroles on Tuesday rejected Tamayo's request for clemency.
 
"It
 doesn't matter where you're from," Perry spokeswoman Lucy Nashed said. 
"If you commit a despicable crime like this in Texas, you are subject to
 our state laws, including a fair trial by jury and the ultimate 
penalty."
 
Gaddis, who had been on the force 
for two years, was driving Tamayo and another man from a robbery scene 
when evidence showed the officer was shot three times in the head and 
neck with a pistol Tamayo had concealed in his pants. The car crashed, 
and Tamayo fled on foot but was captured a few blocks away, still in 
handcuffs, carrying the robbery victim's watch and wearing the victim's 
necklace.
 
At least two other inmates in circumstances similar to Tamayo's were executed in Texas in recent years.
 
The
 Mexican government said in a statement this week it "strongly opposed" 
the execution and said failure to review Tamayo's case and reconsider 
his sentence would be "a clear violation by the United States of its 
international obligations."
 
Tamayo was in the 
U.S. illegally and had a criminal record in California, where he had 
served time for robbery and was paroled, according to prison records.
 
"Not
 one person is claiming the suspect didn't kill Guy Gaddis," Ray Hunt, 
president of the Houston Police 
Officers' Union, said. "He had the same 
rights as you and I would have.
 
"This has been looked at, heard, examined and it's time for the verdict of the jury to be carried out."
 
Tamayo
 was among more than four dozen Mexican nationals awaiting execution in 
the U.S. when the International Court of Justice in The Hague, 
Netherlands, ruled in 2004 they hadn't been advised properly of their 
consular rights. The Supreme Court subsequently said hearings urged by 
the international court in those inmates' cases could be mandated only 
if Congress implemented legislation to do so.
 
"Unfortunately, this legislation has not been adopted," the Mexican foreign ministry acknowledged.