James Patrick March and Tristan Duffy, American Horror Story: Hotel S05E03 ‘Mommy’
The character of Mr March may be based on H H Holmes, one of the first documented serial killers in the modern sense of the term. In Chicago, at the time of the 1893 World’s Columbian Exposition, Holmes opened a hotel which he had designed and built for himself specifically with murder in mind, and which was the location of many of his murders. While he confessed to 27 murders, of which nine were confirmed, his actual body count could be over 200. He brought an unknown number of his victims to his World’s Fair Hotel, located about 3 miles west of the fair, which was held in Jackson Park.