Wait, is the dead one still there and the other one disappeared?
I have heard the sulphur will keep snakes away. Pour it in a line and supposedly they won’t cross it. Look up Copperhead on Wikipedia and get some information about them.
Do you have a basement where it could have gone? think about where it could have gone. They are not aggressive and usually flee.
Copperhead bites aren’t fatal.
Copperhead bites aren’t fatal.... KMA, they’ll make you wish you were dead. If you are already sick ( cancer, diabetes, turd in the aorta) etc. It will kill you.