Frank Irving was the deuteragonist of Sleepy Hollow and former police captain who became the new sheriff of the Sleepy Hollow Sheriff Department after August Corbin's death.
After facing the Headless Horseman, his life made a drastic turn, eventually becoming institutionalized as a psychiatric patient. He eventually escaped to help battle the End of Days, which ultimately led to his death. He was resurrected, presumably, by Jeremy Crane, and was under the former Horseman of War's control from that point on. Upon Jeremy's death, the hold on Irving's soul was released. As of Season 3, he is currently in hiding, with a little help from Jenny Mills, to protect his family.