On this date in 1879, John Henry Holliday, an 1872 graduate of the Pennsylvania College of Dental Surgery, became former Army scout Mike Gordon’s Huckleberry. Mr. Gordon, it seemed, started an altercation in Dr. Holliday’s saloon in Las Vegas, NM. Big mistake. The argument spilled out into the street, where Mr. Gordon drew his pistol–an even bigger mistake–and fired it at Dr. Holliday. In what was sure to be the biggest mistake of all, Mr. Gordon missed. Dr. Holliday responded by drawing his own pistol and shooting at Mr. Gordon. He didn’t miss. Mr. Gordon died. And Dr. Holliday discovered a new favorite game: Play for Blood.
Wikipedia: Doc Holliday
Legends of America: Doc Holliday – Deadly Doctor of the West