(CNN)San Francisco police have doubled the reward for information leading to the arrest of a suspected serial killer known as "The Doodler" who targeted members of the city's gay community in the 1970s -- including a possible sixth victim publicly identified Thursday. The reward for information leading to the "identification, apprehension and conviction" of the Doodler now stands at $200,000, the SFPD said -- 48 years to the day the killer's first victim was found.