Relocate (if you're soft hearted) it before it invites friends (more coons, fleas, ticks, etc) or any of the previously noted diseases along. And find and close the hole he used to get in!
My avatar is my local woodchuck/squirrel killer. 3 in 2011. 1 (I think) in 2012. Your (and my) dismissal of single critters won't affect the global cycle of nature.
As for a quote: "Morituri Te Salutant!"
Rick 90432