A convicted killer faces felony charges after authorities say he threatened to shoot his co-workers following an argument over his attendance and work habits. David E. Downing Jr., 40, was charged with first-degree terrorist threat and unlawful possession of a firearm following an Aug. 20 incident, according to an arrest affidavit from the St. Charles […] Missouri Roofer Accused Of Threatening Mass Shooting Over Workplace Dispute ...read more read less