major technical facility 20,000 employees rely valet park attendant carry conceal gun stop woman stab death raise question well prepare major company like gm possible terror attack security guard even allow arm police investigate woman stab general motor technical center warren mayor jim fouts confirm fox 2.fouts tell us woman walk 8-story build center campus ask speak female employee two meet lobby start talk step outside conversation escalated.it outside visitor pull knife start stab employee neck back abdomen several time fouts say stab break valet driver carry conceal weapon.the employee take hospital tell critical suspect custody time tell suspect cooperate police try determine two women know other.via fox detroit gm security valet park attendant gun save life female stab victim massive tech facility