Roger Chillingworth is a character from Nathaniel Hawthorne's novel, The Scarlet Letter. He is introduced as the estranged husband of Hester Prynne, who returns to New England after being captured by Native Americans. Chillingworth is depicted as a learned man, skilled in medicine, and becomes obsessed with uncovering the identity of Hester's lover. As the story progresses, Chillingworth transforms into a figure of vengeance. He takes on the role of a physician to Arthur Dimmesdale, Hester's secret lover, and uses his knowledge to torment him psychologically. His relentless pursuit of revenge ultimately leads to his own moral decay.