at the time, special agent tom o'connor is with the fbi's joint terrific task force. >> on november 1st of 2004 roy was working in in his district office. >> i was working on my computer, and i saw some motion to my left. when i looked up, there were four men standing in the doorway with ak-47s. one of them said, you come with us, or we'll kill you. >> they zip tied his hands behind his back and ankles. they put a bag other his head. he was brought out to a car. >> like many hostages before him, roy hallums disappears without a trace. american authorities fear the worst. >> unfortunately a lot of the hostages were being shown on video being beheaded. so it was a real concern that a u.s. citizen would be used in that manner. >> but it appears the kidnapers are more interested in money than murder. >> the head of the gang, the sheikh, he said to me that because i was an american they were going to get $12 million for me. >> in order to conceal his presence, the captors hide hallums in a form house 16 miles outside of baghdad. in a hostile region coalition forces call the triangle of death