A mother in Arkansas shot and killed her son during an argument that started because she was stuck on a lawn mower. Now, she’ll spend years behind bars for his murder, RadarOnline.com has learned. According to court records, Tabatha Pebler, 44, called the Fulton County Sheriff’s Office to say she shot her son, Brandon Chrisco, Front Page Detectives reported. Pebler told police she was mowing her lawn and “got stuck.” She asked Chrisco to “help get the mower unstuck”, but he was “upset having to help to get the mower unstuck”, according to authorities. Chrisco came to his mother’s aid, law enfo…