In central South Carolina. (And, just in case you’re wondering, no, I didn’t kill it. I found it in the road while walking the dog.)
Do snakes have ids? 
It may be a juvenile with a different pattern from an adult.
Images are consistent with a garter snake Thamnophis sirtalis
Looks more like an eastern glass snake: glass snake - Search See second from left at the bottom.
Glass snakes, Ophisaurus, are legless lizards with eyelids, ear openings and a lateral groove running most of the length of the body. The dead snake on the bin cover lacks all of these features.
Agree, Google images for garter snake: checkerboard - Google Search
Concur. While Garter Snakes typically have a distinct light mid-dorsal stripe, this linkshows a “checkered” pattern variation from the subject area.
Thanks, all.