APROMINENT Philadelphia crime sleuth is speculating that the region's high-profile murder mystery - the shocking discovery of ex-Pentagon official John "Jack" Wheeler III in a Wilmington landfill - might not be a murder at all. William Fleisher, an ex-cop who co-founded Philadelphia's murder-solving Vidocq Society, said that the discovery of eyewitnesses and surveillance video of a disoriented Wheeler before he died suggests that the 66-year-old man had suffered a head or brain injury. And that apparent disorientation, Fleisher speculated, could have caused Wheeler to voluntarily crawl into a trash Dumpster - either seeking shelter, as happens sometimes among the homeless,...