Killer Kanel was a male Human of 20th century Earth. He was a professional athlete who participated in boxing contests.

In 1930, he fought Sailor Vido in Bay Land Garden in San Francisco. Kanel was the challenger. (DS9: "Past Tense, Part II")

This character was only mentioned in writing.
Killer Kanel replaced Killer Kidd on the boxing poster, which first appeared in "The City on the Edge of Forever".