Question: When did American abolitionist, Kansas Territory Jayhawker, anti-slavery militant, and a friend of John Brown and Walt Whitman, member of The Immortal Ten, die?
Sentence (from "The Immortal Ten"): The Immortal Ten were a group of militant Kansan abolitionists and Free-Staters who on July 23, 1859, freed John Doy from a Missouri jail, where he was being held for allegedly abducting slaves.
Relevant evidence: Yes