Homicide

Man convicted of killing Texas corrections officer asks US Supreme Court to block execution

This undated handout photo provided by the Texas Department of Criminal Justice shows Robert Pruett. On Tuesday, April 28, 2015, Pruett, 35, is scheduled to die for the fatal stabbing of corrections officer Daniel Nagle more than 15 years ago. According to prosecutors, Pruett was angry at Nagle for writing him up for a disciplinary infraction for trying to take his brown bag peanut butter sandwich to a prison recreation yard in violation of rules. (AP Photo/Texas Department of Criminal Justice)

This undated handout photo provided by the Texas Department of Criminal Justice shows Robert Pruett. On Tuesday, April 28, 2015, Pruett, 35, is scheduled to die for the fatal stabbing of corrections officer Daniel Nagle more than 15 years ago. According to prosecutors, Pruett was angry at Nagle for writing him up for a disciplinary infraction for trying to take his brown bag peanut butter sandwich to a prison recreation yard in violation of rules. (AP Photo/Texas Department of Criminal Justice)  (The Associated Press)

Attorneys for a man convicted of stabbing a Texas corrections officer to death over a disagreement about a peanut butter sandwich are asking the U.S. Supreme Court to block his execution.

Thirty-five-year-old Robert Pruett is scheduled for lethal injection Tuesday evening in Huntsville for killing Daniel Nagle in 1999.

The 37-year-old officer was working at the McConnell Unit about 85 miles southeast of San Antonio where Pruett was serving a 99-year sentence for his role in a Houston-area killing.

Evidence at Pruett's trial showed he was upset Nagle had written a disciplinary report after the prisoner tried to take a peanut butter sandwich into a recreation yard in violation of rules. Pruett's lawyers insist he's innocent and that another inmate or corrupt prison guards were responsible for Nagle's death.