For the person asking about the old west comic, they may be thinking about a web comic called "Goodbye Chains.". Unfortunately, the author seems to have taken the comic down from it's old website but there is a tumblr dedicated to it that has a downloadable version of the comic.
I remember Goodbye Chains! I fell off reading it after a while, so I don’t know if anyone died and came back as a ghost or not. I do remember Colin’s hilarious communism.
If one of them did die and come back as a ghost, I hope it was Banquo. I mean. The name.