|“||I just want to thank you both for stoppin' by. We really appreciate your due diligence.||”|
— Donelly to Dean
Deputy Donelly was a Nachzehrer from Quaker Valley, Oregon.
In preparation for The Darkness, a primordial entity that had recently been set free upon the world, Donelly decided to build an army in order to buy himself some time. Donelly infected approximately sixteen people in three months, one of them was the sheriff's wife, Lily Markham, who ended up killing the sheriff when he refused to be turned.
Sam and Dean Winchester came to Quaker Valley to investigate said sheriff's death. In order to cover his tracks, Donelly attempted to kill Dean but the hunter managed to behead him and hide his still-grumbling head in an ice box. Lily used the brothers' belief that she was a victim to retrieve the head and re-attach it. In retaliation for what Dean did to him, Donelly intended to make Dean Sam's dinner once Sam himself had been turned.
Dean foiled Donelly's plans by crashing the Impala which Donelly had been driving, and stuffing his mouth with copper coins before beheading him, which ensured Donelly stayed dead. As a result, all of Donelly's victims, including Lily, changed back into humans.