The earliest version I have read was one from even before the grimms. It was even more cruel than the grimm version. Snowwhite was killed by the huntsman and she ate the lungs and liver for diner. I have to note that I do not know from which source I got this since its a long time ago.

To G who posted before me. I read a simmular story in a japanese manga by Kaori Yuki where the prince (ludwig) is a necrofile and only takes her with him because that is his interest. Snowwhite wakes up and screws his dad. The price kills her in the end and preserves her with a bunsh of other girls. In this story both snow white, the prince and the queen are rather evil in nature.