Shuichi Aizawa (相沢 周市, Aizawa Shūichi) is a member of the Kira investigation team that leaves the team under the guise of needing to support his family because the Japanese police cut their funding (it is only after he leaves that it is revealed that L would have supported them had he stayed). Aizawa uses the alias Aihara (相原, Aihara) to protect his identity. Aizawa returns after L's death, where he is one of the first to suspect Light of being Kira (although he continues to act compassionately towards Light until he is cornered, and goes mad), and helps contribute to his eventual defeat. He becomes the leader of the investigation team afterwards. Ohba decided to make Aizawa the chief of the NPA because he did not want to create a new character in the final chapter, and because he felt that Aizawa is the best candidate because of his connections to the police and Near. He is voiced by Keiji Fujiwara in the Japanese anime and Trevor Devall in the English dub. In the film, he is played by Shin Shimizu.