An amateur sleuth armed with determination and intuition helped cops crack the murder of Leiby Kletzky by tracking his path to doom. Yaakov German isn't a cop or a private detective. He's a property manager and father of 12 with a reputation as a do-gooder. By banging on doors and scrutinizing grainy video, he uncovered crucial clues that led cops to confessed killer Levi Aron. "At the end of the day, he should be given the credit for the cracking of the case," said Rabbi Jack Mayer of the NYPD's Clergy Liaison Program. His investigation into the disappearance of the...