Chett was a member of the Night's Watch serving at Castle Black. Born in a village called Hag's Mire in the Riverlands, Chett spent his childhood helping his father collect leeches. As a young man he killed a woman who refused to sleep with him, was apprehended, and condemned. He chose to take the black and was sent to the Wall. He got a relatively light responsibility when he was assigned to assist Maester Aemon in his duties, until he was replaced by Samwell Tarly (at Jon Snow's suggestion) and reassigned to work with the hounds instead, to his fury.
Chett was part of Lord Commander Jeor Mormont's reconnaisance-in-force of the Skirling Pass. Angry due to slights real and imagined and fearing they would all be killed so far from the Wall, Chett organised a mass-desertion of those unhappy with the situation, but he was instead killed by the Others during their assault on the Fist of the First Men. He later returned to life as a wight and threatened Bran Stark until he was destroyed by the engimatic creature known as Coldhands.