<P> Detective Bowden (Chris Messina) is a recovering alcoholic who is assigned to the case of the suicide . He later explains that the reason for his alcoholism was the hit and run death of his wife and son, five years previously, in which the perpetrator was never apprehended . Meanwhile, five strangers board an elevator, which later becomes stuck between floors . When security finds them, they notice that there is CCTV and a radio with which they can call into the elevator, but they have no way of hearing the passengers in return . Bowden takes the investigation regarding the elevator as it is the same building from which the suicide victim jumped . </P> <P> Ramirez is revealed to be one of the security guards and is disturbed by an image of what looks like a screaming face frozen on the video monitor . His boss Lustig (Matt Craven) dismisses the superstitious suspicions and sends repair technician Dwight (Joe Cobden) to investigate the elevators while Bowden tries to ascertain the identities of the individuals . Only four of the five are accounted for: Vince McCormick (Geoffrey Arend), a sleazy mattress salesman; Sarah Caraway (Bojana Novakovic), a pathological liar who plans to leave her rich husband and take his money with her; Ben Larson (Bokeem Woodbine), a temporary security guard with a history of violence; an unnamed older woman who police mistakenly believe is named Jane Kowski (Jenny O'Hara) who is seen on video to be a thief, and another man who later introduces himself as Tony (Logan Marshall - Green), who does not appear to have signed in at the security desk . </P> <P> The power goes on and off in the elevator, and each time the power is restored, something evil takes place . Dwight falls to his death on top of the elevator, and Lustig is electrocuted trying to restore power . Soon people in the elevator start dying, and the suspicion keeps shifting between all in the elevator . Vince is thrown into a mirror only to have his jugular vein sliced causing him to bleed to death, the old woman is hanged on a lamp cord from the elevator ceiling, Ben winds up on the floor with his neck twisted, and Sarah's throat is slit by a broken piece of the mirror . Finally, the old woman seemingly returns to life, but with red, staring eyes; it is revealed that she is the Devil, and that she has come for Tony and Sarah . In order to save Sarah, Tony confesses to having been responsible for a hit - and - run five years ago in which he killed a mother and her son . Detective Bowden hears him apologize over the radio . The Devil, powerless now that Tony has repented for his sin, curses before vanishing, and the elevator comes back online, sparing Tony's life . </P> <P> As the corpses of Sarah, Ben, and Vince are wheeled away, Bowden decides to take Tony into custody, and, while en route, informs him that he is the husband and father of the mother and son Tony killed in that accident . But despite saying he'd gone over what he'd say, or what he would do if they'd ever cross paths, he forgives Tony . </P>

Who is the killer in the movie devil