Wyatt Earp called Dr. John H. (“Doc”) Holliday, the gambling gunfighter who practiced dentistry in Dallas at one time, the most dangerous man alive. As a young man, Holliday earned a D.D.S. degree in dentistry and set up a practice in Atlanta, Georgia. However, in 1873 he was diagnosed with tuberculosis, the same disease that had claimed his mother when he was 15. He moved to the American southwest in hopes that the climate would prolong his life. Taking up gambling as a profession, he acquired a reputation as a deadly gunman. During his travels he met and became good friends with Wyatt Earp and Earp’s brothers. In 1880, he moved to Tombstone, Arizona, and participated alongside the Earps in the famous gunfight at the OK Corral. This did not settle the matter between the two sides and Holliday was embroiled in ensuing shootouts and killings.