William Frank Horner
- Bats Right, Throws Left
- Debut May 7, 1894
- Final Game May 11, 1894
- Born September 21, 1863 in Baltimore, MD USA
- Died July 14, 1910 in New Orleans, LA USA
Horner died of a skull fracture at age 46 when he slipped on a marble floor in the bath.
"Jack Horner . . . flourished as a minor league pitcher of skill and reputation for almost 15 years . . . when he retired to enter business in Atlanta . . . After his retirement from ball playing he umpired occasionally and in later years he acted as scout for various clubs . . . When he started out in base ball he was accompanied by a catcher named Frank Warner. The two earned much fame as the 'Horner and Warner' battery, and for years they were inseparable." - from Jack Horner's obituary in Sporting Life, July 23, 1910, referring apparently to Edward Warner, who was his teammate on minor league teams