A man was formally charged Tuesday with killing a teenage boy in Tarrant. 16-year old Nathaniel Holder was gunned down as he sat in a car on Alabama Street on Sunday afternoon. Hakeem Gamble shot the boy in the chest during an argument, police said. Gamble is charged with capital murder. He's being held without bond at the Jefferson County Jail. The homicide happened just hours after a 16-year old girl was shot and killed in a drive-by shooting on Westwood Drive in Roebuck. There have been no arrests in the case.