DeForest Kelley in "Steve Canyon" in the episode titled "Operation Jettison" October 11, 1958
"Operation Jettison" frame blowup of "Radar Major" (DeForest Kelley, right) and F-102 pilot Lt. Evans (John Ward, left)...Kelley of course everyone knows as Star Trek's doctor McCoy, (Photo courtesy of The Milton Caniff Estate)
The photo above was a frame blowup taken from "Operation Jettison" episode from the "Steve Canyon" show. This episode is now available on DVD in Volume 1 of "The Complete Steve Canyon on TV".
"This is what the packaging of volume 1 of "The Complete Steve Canyon on TV" dvd set looks like