The suspect 's motive was revenge against the U.S. military for its Afghanistan operations . Nicholas Alden , 25 , a senior airman from South Carolina , was killed , the military says . Comment: Uka then shot him in the back of the head with a handgun . Uka allegedly confessed and says he acted alone , a German intelligence official says .
The suspect 's motive was revenge against the U.S. military for its Afghanistan operations . Nicholas Alden , 25 , a senior airman from South Carolina , was killed , the military says . Comment: Uka allegedly confessed and says he acted alone , a German intelligence official says .