A gunman fatally shot a woman and injured two others before killing himself outside a hospital in Knoxville, TN, the police said. The attack happened at about 4:30 p.m. near the patient discharge area of the Parkwest Medical Center, the police said. One woman died at the scene and the other two were taken to The University of Tennessee Medical Center's trauma unit for treatment. At least one of the surviving victims was in critical condition at the hospital and was scheduled to undergo surgery, police officials said. Investigators are trying to determine a motive and considered it a random act of violence.