Vili

Mr Vili was a Norse god. He was killed by Sam with the Mjölnir.

Season 8
To be added

Trivia

 * In the lore, Vili is the brother of the Norse god Odin, ruler of Asgard. Odin was the father of Thor, god of Thunder, who owned Mjölnir. Odin has appeared on Supernatural in the Season 5's Hammer of the Gods''.