Agent Dillon, along with agents Solof, Taylor, Landon and Special Agent Jack Bauer, was assigned to protect the recently-defected IRA member Moira O'Neal from harm by her former associates until she could be debriefed by the CIA.
Dillon, Solof, and Bauer transferred O'Neal by helicopter to a safe house in the Arizona desert, where Taylor and Landon were already stationed. Dillon took up a position on the porch of the house until contact with Solof and Taylor was lost. Coming inside the house, Dillon discovered the phones and radios were all dead. Hostiles began storming the house and Dillon was able to take a couple of them out before getting shot in the chest. His bulletproof vest took most of the hit, but he was killed a short while later when Megan destroyed the house with a missile launcher.