Monroe was a Rainbow negotiator at Píc des Pyreneés. His plan was to talk to the terrorist leader in person, while Alpha and Bravo team were getting ready to strike. When Bravo arrived at where the hostage situation was taking, place a Rainbow operative, Gabriel Nowak, fired prematurely. One of the terrorists panicked and shot Monroe, killing him.
In a stark contrast with the usual image of the Rainbow operative, Lt. Monroe is seen wearing a suit, with a sole insignia indicating his affiliation.