Fighters with a knock-out jab?

[Panamaniac]

Has Sonny Liston ever knocked someone out with a jab?

While it may not have been the coup de grace, I seem to recall him stagger Patterson in advance of the other KD shots. Both fights.

[Debopam Roy]

Sonny Liston, and Larry Holmes. While the former was stronger, the latter was faster and deadly accurate. A great case can be made for Ali, but he KO'd most of his opponents through combinations. Another name that comes to mind is Gene Tunney. He dazed Dempsey a few times with his solid jab.