UPDATED: Friday, April 13, 2012 - 8:54am
22-year-old Dustin Keith Porter of Copperas Cove was arrested Thursday.
Police say he's one of many people who beat up a 20-year-old man before robbing him on December 9.
Police say Porter also hit the victim with the side mirror of his vehicle as he drove away.
Porter is charged with aggravated assault with a deadly weapon robbery and assault that causes bodily injury.