Towery, 80, in Amarillo on November 13, 1996.
Throughout her trial, Holberg claimed that she acted in self-defense when Towery began attacking her.
Holberg has since denied ever discussing the incident with Kirkpatrick.
Circuit Court of Appeals.
The appellate courts decision will send the case back to the trial court for further proceedings.
On September 17, 2014, Coleman received a lethal injection of pentobarbital.
The state of Texas has executed 593 inmates since 1976
