The only way I will kill a king snake or bull snake is by accident. All other snakes, kill first ask questions later.
Rattlesnakes don't last long when they cross my path. Just the way it is. I love seeing king snakes and bull snakes in the yard. Makes me feel good that there is a lesser chance of seeing a rattler.
You killed it by accident clearing weeds. Guess he was just in the wrong place at the wrong time. Hate when that happens. Pretty snake you whacked! lol
Kique