A gunman on a motorcycle shot and killed a judge Tuesday in central Tehran and then sped off, a judiciary spokesman said. Judge Masoud Moqadasi handled a case against an investigative reporter jailed in 2000 for reporting that intelligence officials murdered five Iranian dissidents in 1998, judiciary spokesman Jamal Karimirad said.The journalist Akbar Ganji remains in jail. Iran's Intelligence Ministry later blamed the murders of the dissidents on "rogue agents" in the secret service. As the judge drove away from his office, the gunman sped up to Moqadasi's car on a motorcycle and sprayed it with rifle fire and then fled, Karimirad told The Associated Press. Moqadasi headed the Tehran judiciary complex and specialized in cases of social vice, Karimirad told The Associated Press.