Little Rock police arrested a man today for killing his son. Sixty-nine-year-old Bobby Lee Walloch of Little Rock told police his son had a knife and that he shot him. The victim was 47-year-old Kim Alan Walloch of Mountain Pine. Police responded to a call about a domestic disturbance at 3 a.m. today. When they arrived at the home, the elder Walloch was present. He was taken to the Pulaski County Jail and subsequently charged with first-degree murder. The victim`s body was face down. Police say the son was shot with a .38-caliber revolver.