text: if a mass murderer has a deathbed conversion, does this negate the cause/effect karma of his crimes?   christians for the most part will tell you yes. i'm not sure what the other main religions would tell you on this one. i don't believe any "conversion" that's based on the fear of death is genuine to begin with. the law of cause and effect are not negated just because someone thinks that confession corrected everything they did.