Logan Nelson

Logan Nelson is a fictional character and the main protagonist of the film 2017 Jigsaw, and the new and current Jigsaw of the series.

Biography
Logan Nelson is the medical examiner for the city police department. He had served with the United States Army in Fallujah during the Iraq War, but was captured, interrogated, and tortured by the enemy. This experience, combined with the psychological injury of his wife Christine's murder, leads Halloran to suspect him as the new Jigsaw. When he and his assistant, Eleanor Bonneville, find the site of the new game, Halloran ambushes them; both he and Halloran are knocked out and placed in collars rigged to fire laser cutters at their heads unless they confess their wrongdoing. Logan appears to die when his collar activates, but then stands up alive and well after Halloran admits to his own unethical behavior as a police officer.

Logan reveals to Halloran that 10 years ago, while working at a hospital, he had inadvertently mixed up John Kramer's x-rays with those of another patient, leading to a delay in treatment for John's cancer that allowed it to become terminal. He was placed into one of John's games, in which he was wounded on a set of circular saws. However, John chose to spare him because he had made an honest mistake. John recruited Logan; 10 years later Logan set up a new barn game using three people associated with Halloran's past cases (including Christine's murder) in order to draw him in and frame him as the new Jigsaw. With Halloran's confession on tape, Logan activates Halloran's collar which slices his head open.