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Donald G. Triplett, the first person to be diagnosed with autism, has died. He was 89.

Donald Triplett, a Mississippi man who became known as the first person diagnosed with autism and was the subject of 'In a Different Key', died at 89.

Donald Triplett was the first person to have been diagnosed with autism spectrum disorder in the 1940s, he died peacefully at his home in Mississippi after a period of extended illness

Donald G. Triplett, the first person to be diagnosed with autism, has died. He was 89.

The Mississippi man known as “Case 1,” the first person to be diagnosed with autism, has died. Bank of Forest Senior Vice President Lesa Davis confirms Donald G. Triplett died