Jinpei Matsuda was originally a member of the Tokyo Police bomb squadron. Matsuda was skilled at boxing since he was taught by his father who was pro-boxer. He was skilled at mechanical since he could fix cars and he was also skilled at taking gun apart,repair it and put it back together, also he could defuse bomb quickly in three minutes.
Matsuda was shown in a series of Sato's flashbacks, in which he was depicted solving the case of the bombing and sending Sato the location of the second bomb, shortly before dying in the explosion on the Ferris Wheel.