CORPUS CHRISTI (March 13, 2014) A May 21 execution date has been set for death row inmate Robert Pruett, who was convicted in the deadly stabbing of a Texas prison guard 15 years ago.
Judge Bert Richardson set the date Wednesday after ruling that DNA testing would not have changed a jury's decision.
Additional DNA testing ordered last year also led to inconclusive results.
Pruett was sentenced to die for killing Dan Nagle, who was a guard at the McDonnell Unit near Beeville.
Prosecutors say Pruett, who was serving 99 years for a Harris County slaying, was angered by a disciplinary report Nagle submitted after he tried to take a sack lunch to a recreation yard.
Pruett faced execution last year, but won a stay to allow additional DNA testing on a partial palm print on the report.
The source of the print remains unknown.