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regulus ARCTURUS black (sirius's brother, remember him)

http://www.hp-lexicon.org/wizards/regulus.html

information taken from mugglenet.com thanks to people at harry potter wizard world yahoo group for posting

oh yeah and the only reason it was confirmed is cause it was obvious, the only other good theory i heard was amelia bones son but yeah always knew it was regulus, that was toooooooooo easy

yeah i read on muggle net that it was Sirius bro too and I thought that was pretty obvious. I didn't pick up on it myself when I was reading the book but it seemed obvious when someone pointed it out.