Clash of Red and Black! (Exclamation) Meitantei Conan : Season 1 Episode 493

Kakuzō shows Kogoro a photograph of Tango's body in a pool and points to a white glove Tango is wearing. He reveals that the glove was the same glove their previous butler wore before a car accident killed him, and that Tango's murder occurred on the anniversary of the butler's death.