Former Unsay Mayor Andal Ampatuan Jr. pleaded not guilty to murder charges . Evidence filled against him in over November killings in Maguindanao province . November : Killings an attempt to stop Ampatuan opponent from running for mayor . Nov. 23 massacre killed 40 people ; thirty journalists were among the dead .
Datu Unsay Mayor Andal Ampatuan Jr. pleads not guilty to murder charges . Charges filled against him in over November massacre in Maguindanao province . Authorities : Killings an attempt to stop Ampatuan opponent from running for governor . Nov. 23 massacre killed 57 people ; thirty journalists were among the dead .