The body of a man found in Patapsco State Park in April was identified Monday through his knee replacements, according to Maryland State Police. State medical examiner ruled John H. Hagegeorge, died of natural causes and exposure but they could not identify the 55 year old through conventional means. Officials used the serial numbers to track down the hospital that had used them. Hagegeorge, whose last known address was on Redcliffe Road in Catonsville, appeared to be living at a makeshift campsite where his body was found. His estranged wife told police that she didn't report him missing because she didn't know he was missing. Hagegeorge's body was found by searchers who were in the park looking for Phylicia Barnes, the teenager who had disappeared from Northwest Baltimore in December and was the subject of a nationwide search. Her body was found later in April in the Susquehanna River, and her death ruled a homicide. No arrests have been made.