Meitantei Conan › Season 1

Chapter 9 — Tenkaichi Festival Murder Case

Sasai Norikazu murders his partner, award winning author Imatake Satoru in cold-blood and coincidentally runs into Conan, Ran, and Kogoro at the Festival of Lights where they take a few pictures. He is approached by Inspector Yokomizo who informs him of Satoru's murder. Conan is certain Norikazu killed Satoru but he has the perfect alibi substantiated with photographs. Although the disposable camera and photos in question have not been tampered with, Conan re-examines the photos and with supporting clues is able to prove that he is the murderer. Kogoro is put to sleep and Conan impersonates his voice to explain that the pictures were taken at the festival the previous year using the same camera, then saved it until the day of the murder. As proof he points out that some of the pictures show an untanned line on Norikazu's wrist, where in others it's pale from his watch. Norikazu confesses that he murdered Satoru out of revenge, whose work was chosen to be published over his at the last minute. Satoru later became famous when he won an award for a previous book and given a contract. Norikazu, who co-wrote the same book, was left with nothing. (Source: Wikipedia)