Meitantei Conan S2013E13 - The Evening Cherry Blossom Viewing Route on Sumida River (Part 2)

Despite being sick, Kogoro begins investigating the coworker of the victim. Conan investigates as well and finds clues that lead him to the culprit. Now, Kogoro is too sick to investigate and Conan has to figure out another way to use him to solve the case.