COPS ASK: HAS LEIBY KLETSKY'S KILLER STUCK BEFORE?

SERIAL KILLER?

TRAGIC

COPS probing the twisted killer of little Leiby Kletzky fear he may have struck before and have begun a detailed investigation into whether he is a first time killer. Examining loser loner, Levi Aron's Brooklyn home, which he shared with his dad and uncle, officers found bags marked "kids pants" and a blue child's spoon and a pink cup."    
A source told the NY Post: "There were two boxes in a closet, and they appear to have been there for a while.
"If there's any reason to think that he's done this before, we will come down on him hard. We're