August 1, 2010 12:04 am Missing Kayaker Presumed Dead The search for a missing kayaker on the Potomac River has turned into a recovery mission. Crews spent more than eight hours souring air, land and water for the Prince George’s County man. Local 1:27 1 dead, 4 hurt in Suitland crash 3:27 How the pulley system helps first responders make rescues 0:24 1 killed, 23 others hurt in Maryland party bus crash 1:05 Court docs reveal moments leading up to Dunbar High School shooting that hurt teen 2:29 George Washington University president says pro-Palestinian encampment is ‘unlawful'