Deputy Walker is a deputy with the White Pine Bay Sheriff's Department.
Biography
Season 3
After the body of a female was discovered in the marshes, Deputy Walker briefed Sheriff Alex Romero on the situation and left when Marcus Young showed up asking to speak with Romero privately. (Persuasion)
Deputy Walker was already at the scene of Annika Johnson's death (the motel) when Romero arrived. He told Romero that Norma was in the motel office.
He later informed Romero that Annika was shot twenty minutes before she got to the motel and that the car she used was registered to the girl who was found in the marsh. (Unbreak-Able)