Late in his editorship, Murray learned that one especially prolific reader named W. C. Minor was confined to a mental hospital for (in modern terminology) schizophrenia. Minor was a Yale University-trained surgeon and a military officer in the American Civil War who had been confined to Broadmoor Asylum for the Criminally Insane after killing a man in London. Minor invented his own quotation-tracking system, allowing him to submit slips on specific words in response to editors' requests. The story of how Murray and Minor worked together to advance the "OED" has recently been retold in a book, "The Surgeon of Crowthorne" (US title: "The Professor and the Madman"), later the basis for a 2019 film "The Professor and the Madman", starring Mel Gibson and Sean Penn.