Wilmot Wood Brown Jr (Birdkiller Brown as he was known on the Cayman Islands) was born on 19 May 1868 in Charlestown, Mass. The son of Wilmot Wood Brown Snr and Anne L. Brown. He died at 11 am on 10 Jul 1953 at the Hotel Mexico, Chilpancingo, Guerrero, Mexico.
He seems to have had issues remembering his birth year, as on various official forms it was given as 1868, 1869, 1870 and 1871. Given that such "amnesia" is often due to vanity I have chosen to use the earliest date and that suggested by the 1880 census. He lived at various times in Somerville, Mass and El Paso, TX. His birthdate is certainly not in the late 1870s.
By the way having read a bit about Mr Brown, he is honestly one of the most contemptible of all the people that have been honored in ornithology. The fact he is recognized in several names is stomach churning. If there was a process for removing his honorifics through the IUZN I would seriously think about doing so...