I know this is in the wrong section but im on my phone and couldnt find the "field herping" section.

Hey everyone. My friend was out on the lake yesterday, and his dad had killed this snake because he didn't know what it was. I did see it in person, but by the pictures it looks like a cottonmouth. But I've never seen a cottonmouth with color like this. Any ideas? Sorry, pics are slightly gruesome.