Tweet   A three-hour standoff between police and a suspected robber Thursday evening ended with gunfire and the man, who police said held seven people hostage inside a suburban bank, dead on the sidewalk.  Cary police later identified the dead suspect as Devon Mitchell, 19, of Cary, but did not immediately release other information about him. The incident, which began when police were called to the W More..achovia branch at 10050 Green Level to Durham Road, unfolded live on local TV, culminating in Mitchell walking from the building while holding a gun to the head of a female and then being shot by police snipers as the hostage sank to her knees .