The body of Coretta Scott King is back in the United States. A line of vehicles carrying the body left a health care facility in Rosarita Beach, Mexico Tuesday evening. The casket was transferred to a hearse before crossing the Mexico-United States border. Doctors say Mrs. King had only been at the facility for four days. The official cause of death is being listed as respiratory failure. King had recently suffered a stroke and a heart attack. She was 78 years old.