Col. James Keller (Robert Patrick) was a former US military black ops officer who dishonourably discharged for and later worked for The Ring.
In 1989 Alex Coburn is being reviewed by a ranking officer regarding his application for special forces training while in Honduras. He application is not accepted, but he is then approached by Keller who asks him if he wants to join his NSA black ops team of the most elite soldiers and snipers, which Coburn accepts. Keller allows Coburn to make a final phone call to his Kathleen McHugh fiancée and then Alex Coburn is officially "killed" in action in Honduras and becomes John Casey.
The full extent of Keller's activities during the time from his recruitment of Casey to when he re-emerged in the present day are unknown, however at some point Keller joined the Ring and turned former NSA combat instructor Ty Bennett as well. A flash by Chuck suggests that Keller had been dishonorably discharged.
In "Chuck Versus the Tic Tac", he contacted Casey following a failed attempt by the Ring to seize Castle and blackmailed him into stealing a top-secret government emotion-suppressing and performance-enhancing drug called Laudanol. Keller threatened to murder Casey's ex-fiancee,Kathleen McHugh, if he refused to obey. Casey steals the pill whilst Team Bartowski are spy proofing CIA storage facility but is ratted out as the thief by Chuck, and promptly arrest and put in a cell at the CIA facility. Keller breaks Casey out as he hasn't been given the drug yet. Casey is faulted during his attempt to get the drug from its hiding place at the Buy More. Casey meets Keller and refuses to give him the drug, which prompts a fight to begin which ends with Casey strangling Keller to death.
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