Case Closed (1996)

Season 8

Episode 23: The Bay of Revenge (Part 2)

Conan investigates Kumada's suicide and finds several suspicious points that make him conclude it was a murder. He also finds out that a boat and anchor were stolen right before Tachibana's boat capsized and he drowned. Conan shoots Kogoro with a sleeping dart and deduces that the killer was the caretaker lady, whose son was murdered by Kamada and covered up by Tachibana.