Jared Renfrew, serving life for the murder of a girl, claims to have information about Red John that he learned from a former cellmate, Orville Tanner. He offers this information to Jane if he can prove Renfrew was wrongfully convicted.
Jane successfully proves Renfrew's innocence, leading to his release. However, Renfrew is lured to a hotel room by Red John and murdered before he can reveal the killer's true identity.
At the crime scene where Renfrew's body is found, Red John leaves a message written in blood on the wall that suggests his reach is far greater than Jane realized. Character & Production Details
This episode is considered crucial for establishing the "Red John is many" theme—the idea that Red John is not just a lone serial killer but the leader of a vast, secret network.