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Originally posted by: ADigitalMan
Oh, I don't doubt that Regulus Black is dead, but the point is if he is indeed is "R.A.B." then he at least obtained -- and perhaps destroyed -- one of Voldemorts horcruxes before dying. That may very well be why he's dead -- and he was a Slytherin to boot..
Don't forget that Regulus was also a Death Eater, which makes even more sense if you think about it. Maybe he finally realised the error of his ways, and was killed by Voldemort after Voldemort realised what Black had done. Just a thought.