Oikawa’s father had actually been practicing to imitate his son's style to finish the fourth painting for him as a gift. Key Characters
Disguised as Officer Takagi throughout the investigation to clear his name, as he was being framed for the theft. Takeyori Oikawa: The culprit and son of the victim. Detective Conan Episode 470
Oikawa was unable to paint since his wife's death. He planned to fake a theft to save his career but killed his father, fearing he would expose the scam. Oikawa’s father had actually been practicing to imitate
Conan Edogawa solves the mystery of the "missing" painting and identifies the culprit behind the murder of the painter's father. Detective Conan Episode 470