Kogoro Mouri, Suspect (1) Meitantei Conan : Season 1 Episode 199

Kogoro is relaxing at a luxury hotel. After dinner, a drunken Kogoro goes missing, prompting the others to search for him. Eri calls his phone, hears it ringing from the inside of Ritsuko’s room, open the door with the chain lock in place, and find Ritsuko strangled to death. Worst of all, Kogoro emerges from the bed, much to everyone’s shock.