Hi, Greg!
I recommend that you release him back to the wild, if you have not already done so. If you really would like a pet snake, please consider getting a captive bred snake. People trying to keep wild snakes not only can affect wild populations, but it's also not very successful. If he is injured then I'm sure that there is a rescue that can help him and release him when he is well, or if you don't mind the expense, with a herp vet's help, you can rehab him for release.
I apologize if I sound brunt, but I'm somewhat of an advocate for not owning wild caught snakes.
Oh! One more thought, check with your local authorities regarding snake ownership. Some areas completely outlaw it, some require liscences, some say you can only keep certain kinds, and some (like where I live) don't care either way. I would hate for you to go through the expense of owning a snake and caring for him only to have him siezed.
Thanks for letting me voice my thoughts!