Wormtail is killed by his silver hand

In the cellar of Malfoy Manor, Wormtail attacked Harry Potter, who exclaimed “You’re going to kill me? You owe me!” Wormtail hesitated at this, and the magical silver hand, sensing the weakness, turned on Wormtail and strangled him:

His own silver fingers were moving inexorably toward his own throat. The silver tool that Voldemort had given his most cowardly servant had turned upon its disarmed and useless owner; Pettigrew was reaping his reward for his hesitation, his moment of pity; he was being strangled before their eyes. (DH23)