In the almost ten years that we've lived in our suburban Atlanta home (that backs up to wooded/pond acreage), we've have had three snakes that have fallen victim to similarly natural diseases. Two were struck down in their prime by buckshot poisoning and the other had a sever case of German Shepard Toothitis.
We too were saddened by their untimely deaths.
I started up a snake in the back yard a couple of weeks ago, and it looked harmless to me (round head and longitudinal yellow stripes) but the handyman working next door insisted it was a copperhead and killed it with a shovel. He made such a mess of it I didn't care to look for any fangs, since it was too late anyway.