Daft Jamie

 was a young halfwit living in 19th-century Edinburgh. He was murdered by Burke and Hare. Evelyn Smythe was upset that she and the Sixth Doctor could do nothing to change his fate but the Doctor assured her that he would live on in history and in their memories. (AUDIO: Medicinal Purposes)

Behind the scenes
Although it is not stated in the story itself, Daft Jamie's real name was James Wilson and he was 18 years at the time of his murder in October 1828.