After Lyra attempted to kill Krennic one of the Death Troopers fatally shot her which led to her death.
In 13 BBY a squad of Death Troopers accompanied Orson Krennic to Lah'mu to retrieve the Imperial scientist Galen Erso. Vader and a small force of unharmed Death Troopers then pursued and executed the hive and their Queen. An assassination attempt carried out by a local Geonosian hive caused the deaths of several Death Troopers as they were crushed by inbound rocks.
Commander Orson Krennic arrived on Geonosis and was accompanied by a squad of Death Troopers. Vader was then ordered by Emperor Palpatine to uncover who was behind the sabotage attempts.
During the construction of the first Death Star over Geonosis a group of Death Troopers accompanied Governor Tarkin to confront Darth Vader on a security breach. The name of the troopers derived from Emperor Palpatine himself, whom capitalized on the rumors of the group being a product of unnatural research into using undead troopers to fight for the Empire.
