May 21, 2015 6:15 pm Police: Trio of Robberies Have Similar M.O.s Authorities say a man who robbed a Dunkin Donuts with a knife this week also hit two other businesses earlier this month. NBC Chicago’s Regina Waldroup reports. Local 3:10 Suspect charged in killing of Chicago police officer faces additional charges 2:03 Prosecutors detail how Calumet City cold case unfolded, with suspect finally arrested 0:54 Richest person in Illinois revealed in new Forbes Magazine ranking 1:45 Video shows arrest of suspect in CPD officer Luis Huesca's murder 2:25 Thursday afternoon forecast