Hello, Rosalind - quite a pleasure to meet you, and I promise that I will do all I can to satisfy your morbid curiosity.
It's somewhat of a long story, but the long and short of it is that I was cursed by an evil entity and the only way to break it forever was to sacrifice myself, which I did. Then there was a seance and a trip a few mad people organised to come fetch me from purgatory. Now here I am.
As for how it's possible...you're new here, aren't you?