Red-Handed Jewel Robber (1) Meitantei Conan : Season 1 Episode 401

The Detective Boys meet Takagi in a jewelry store, and soon after, they witness the store being robbed. They chase him to a nearby roof, which he jumps off of, killing himself. Conan notices several suspicious things about the incident, leading the police to believe that it wasn't as simple of a case as it first appeared to be.