Has anyone heard of this?

My son was looking for a corn snake, so I answered an ad on Craigslist. This is the e-mail I received in response...

sorry,you're a little late..i had him for 8 days and
when i came home,he was laying there,he had a weird
green spot on his belly..he died,i cant figure out
from what...plus he wouldn't eat is pinky,cause when i
was cleaning it out,i found the mouse with a black
head..have you ever heard of anything like that with
snakes?he was brown and white,but this weird green
spot was on his belly...i heard maybe it was b/c i
didn't give it bottled water..i thought it could drink
tap.i didn't think it mattered

Anyone have any idea what that sounds like it could have been?
Thanks for any info.

It was his gall bladder. It's common in dead snakes.

You can find quite a few corns here or at cornsnakes.com.

Thank you for the info. I only contacted this guy because he was in our area and we could have picked the snake up rather than shipping it.