KANSAS CITY, Mo. (AP) - Margaret Truman, the only child of former President Harry S. Truman who became a concert singer, actress, radio and TV personality and mystery writer, died Tuesday. She was 83. Truman, known as Margaret Truman Daniel in private life, died at a Chicago assisted living facility following a brief illness, according to Susan Medler, a spokeswoman for the Harry S. Truman Library and Museum in Independence. She had been at the facility for the past several weeks and was on a respirator, the library said.