Detectives are investigating the death of 81-year-old Xuanfang Zhou. Zhou was found dead Thursday morning, Aug. 2, in Runnymede Park at 195 Herndon Parkway. Preliminarily, there is no indication of criminal activity. Zhou was originally reported missing by his family after he went for a walk in the morning and didn’t return home. Patrol units and a K9 team did an extensive search but they were unable to find him. Reston police are currently working with Herndon Police because Runnymede Park is in their jurisdiction, but the Reston department will be the lead agency for this investigation.