Although he often played tough, snarling sergeants, gunslingers or cops, in reality Evans had very poor eyesight and could barely see without his glasses. Only in Donovan's Brain (1953) did his character, a scientist, get to wear glasses, and Evans at the time remarked that it was a revelation for him to be able to actually see the actors he was working with.
Served in the US Army during World War II, during which he received a Purple Heart for wounds received in battle and a Bronze Star for bravery.