MOUNT VERNON, Ill., (KBSI) — A 31-year-old woman has been charged with first-degree murder after a man was fatally stabbed Tuesday night in Mount Vernon. Police, firefighters and ambulance crews responded to a home at 409 S. 20th St. around 7:30 p.m. for a report of an unconscious man who was bleeding. First responders found the man with a stab wound. He was taken to a local hospital, where he was later pronounced dead. Officers found Quencie Fa…