A decade ago, the law enforcement community of Chester County wanted to pay tribute to a sheriff who was killed on his second day on the job in 1887. They chose to memorialize the long-forgotten sheriff, Benjamin Irey, with an 18-by-15-inch bronze plaque at the courthouse in West Chester. Usually, such ceremonies involve descendants of the fallen hero's family. But in the case of Benjamin Irey, county officials were unable to find any of his descendants-- and, for a very peculiar reason: The Irey family bloodline was obliterated by a baffling series of strange deaths.