Child star best known for her guest starring roles as Arnold`s wheelchair-aided pal Kathy on "Diff`rent Strokes". She was afflicted with osteogenesis imperfecta, a disease in which a person`s bones fracture easily. Where Are They Now: (2007) Now known professionally as Melanie Bernhardt. She is the founder/executive director of Train Rite, an organization that trains shelter dogs to serve the disabled.
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