Kogoro-san is a Good Man (1) Meitantei Conan : Season 1 Episode 661

Ran and Conan meet Takae Kiritani, an elderly woman who claims Kogoro had been visiting and assisting her on a weekly basis. They discover that Ryohei Onda has been posing as Kogoro to entertain and assist Kiritani. During their visit, a neighbor, Gensuke Denikawa is found dead by the other neighbors.