Foley also releases letters written by the journalist while in captivity in June . British ambassador says that identification technology is being used to ID militants . A video posted online shows the militant as James Foley . The militant speaks with what witnesses describe as an English accent .
Foley family releases letter written by the journalist while in captivity in June . British ambassador says voice identification technology is being used to ID killer . A video posted online shows the militant beheading James Foley . The militant speaks with what experts describe as an English accent .