Butler's disappearance is suspicious because it is unlike her. She lives by routine, according to friends and family, and she's usually in close contact with her mother and her sister.
Investigators haven't found any signs of trouble inside Butler's house, police said. They have watched video from her home security system.
Butler is a dark-complexioned black woman who stands 5 feet 3 inches tall and weighs about 120 pounds. She has brown eyes and brown hair.
Anyone with information about Butler's whereabouts should call police at 202-727-9099.