Who was the 1989 slam dunk champion who went by the nickname of "Sky"?

The 1989 slam dunk champion who went by the nickname “Sky” was Kenny Walker. Representing the New York Knicks, Walker won the NBA Slam Dunk Contest on February 11, 1989, in Houston, Texas.

Walker was a 6-foot-8 forward from the University of Kentucky, where his leaping ability earned him the nickname “Sky.” He entered the contest during a field that did not include recent champions Michael Jordan or Dominique Wilkins, but still faced notable competitors including Clyde Drexler and Spud Webb. Walker’s performance made him the first Knicks player to win the event.

The nickname can cause a small mix-up with the Star Wars character Luke Skywalker, and some references shorten Walker’s nickname to “Sky” while others use “Skywalker” as a playful variation. He won the contest only once; his 1989 victory remains his signature NBA achievement. The Knicks later added other dunk champions, including Nate Robinson and Obi Toppin, but Kenny Walker was their original winner.