Avila became a suspect when he fled to Mexico, authorities have said. A motive for the shooting was never made clear, but witnesses reported the two men had been fighting.
Amarillo police said Avila was in a Mexican prison from 1995 until July for a murder he committed there. Mexican officials became aware of Avila's arrest warrant in Texas, contacted U.S. officials and extradited him.
Avila was returned to Texas on July 11, court records indicate.
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