Raye Penber is an American Investigator from the FBI, who was sent to Japan along with 11 other FBI agents to track down Kira. Raye was assigned to investigate the Yagami family for any suspicious behavior; but eventually stops suspecting Light.
Light staged a bus-jacking incident in order to obtain Raye's identity. Light, acting as if Raye were a part of the bus-jacking persuades Raye into revealing his FBI identification card. Raye shows Light, but is hesitant to do so.
A week after the bus-jacking, Light acting as 'Kira' follows Raye and use him as a 'pawn' to track down the other 11 agents. He gives Raye an envelope containing sheets of paper, taken from the Death Note. Raye, unknowingly, writes the names of the other agents on the paper.
Light kills Raye soon after. Before Raye dies, he sees Light, realizing that he is indeed Kira.
Raye is engaged to a former FBI agent, Naomi Misora, who later attempts to investigate the 'Kira' case.