Board Thread:General Discussion/@comment-26340222-20160312083256/@comment-25551215-20160312151927

Quite possibly. If you look at Underbrooke, most of the souls there died in Storybrooke (save for the Blind Witch, James, the Valet, and probably someone else I missed). So unless they went to Underbrooke, people who died in different realms went to the Underworld corresponding to their realm.