The following info is from: http://www.nvahof.org/_original_site/genesis_u-2.html
The U-2 plane's challenging flight characteristics and fragility resulted in the deaths of four Agency pilots. Here we look at the lives of these pilots: Wilburn S. Rose, Frank G. Grace, Howard Carey, and Eugene "Buster" Edens. ... On Sept. 17, 1956, pilot Howard Carey took off from Lindsey Air Force Base in Wiesbaden, Germany. His U-2 mysteriously disintegrated in mid-air, perhaps caused by the jet wash from four fighter aircraft nearby. Carey was less than three weeks shy of his 34th birthday when he died. ... Remembering CIA's Heroes: Agency Pilots in the U-2 Program. Currently, there are 87 stars carved into the marble of the CIA Memorial Wall. The wall stands as a silent, simple memorial to those employees "who gave their lives in the service of their country." The CIA has released the names of 54 employees; the names of the remaining 33 officers must remain secret, even in death. The CIA honored Rose, Grace, Carey, and Edens with stars on the CIA Memorial Wall in 1974. All four men served in the CIA's Directorate of Plans*. They are remembered for their bravery and dedication. Their names are included in the CIA Book of Honor. A memorial on Mt. Charleston overlooking Groom Lake is being planned to recognize all those lost.