October 28, 2009 7:53 pm Police Search For Murder Mystery Tipster Investigators want to hear from a mystery tipster who called them four days after the killing of a Northeast teen. Local 1:27 1 dead, 4 hurt in Suitland crash 3:27 How the pulley system helps first responders make rescues 0:24 1 killed, 23 others hurt in Maryland party bus crash 1:05 Court docs reveal moments leading up to Dunbar High School shooting that hurt teen 2:29 George Washington University president says pro-Palestinian encampment is ‘unlawful'