McKinney was one of Clint’s favorite character actors. Watch Bill as the psycho with the rabbits in his car trunk in “Thunderbolt and Lightfoot.” Clint must have paid him well.
Like Geoffrey Lewis, he used McKinney a lot. Bronco Billy and The Gauntlet also come to mind.
He was good actor, convincingly playing psychos, to creepy Sheriffs, to "nice guys".