Killer was a clone trooper pilot in the Clone Wars, serving under Jedi General Obi-Wan Kenobi as part of his fleet. During a Separatist assault led by General Grievous against the Republic fleet, Killer flew a clone Z-95 starfighter alongside other pilots. He and Engle, a clone trooper pilot and friend, fought together, with Killer providing covering fire as Engle executed bombing runs on the Separatist fleet. Sadly, Killer's craft was destroyed during the engagement, resulting in his death.
Killer's helmet and Phase II clone pilot armor featured distinctive red and gray decorations.