Mad Bomber-Daryl Lamonica(I think that's how you spell it)
The Assassin- Jack Tatum (clearly a Raiders theme here)
For the NFL, one from yesteryear that stands out to me is "Bambi" for HOF'er Lance Alworth.
You probably also have enough material to make a team nickname quiz, too. Doomsday Defense, Pride & Poise Boys, Purple People Eaters, Orange Crush, Killer Bees, Over-the-Hill Gang, Fearsome Foursome, Steel Curtain, Air Coryell, Ground Chuck, Monsters of the Midway, Hogs, etc.