Later , Sergeant Alvin Smith , Chuyen 's former handler , became concerned for his safety .
Later , Sergeant Alvin Smith , Chuyen 's former handler , sought sanctuary with the CIA in Nha Trang , where he revealed that Chuyen had been killed .
Later , Sergeant Alvin Smith , Chuyen 's former handler , became concerned for his safety and sought sanctuary with the CIA in Nha Trang , where he revealed that Chuyen had been killed .