Chaimson was a high-level S.H.I.E.L.D. agent at the time of the collapse of the organization and the re-emergence of HYDRA. He was one of five core agents loyal to S.H.I.E.L.D. whom Agent Victoria Hand trusted and relied upon. When Agent Hand tested the loyalty of Agents Simmons and Triplett, Chaimson was taken by surprise and held at knife-point by Triplett. Later, he, along with Agents Jacobson and Ward accompanied Agent Hand as she escorted John Garrett to the Fridge. He was killed en route by Ward, who was secretly a HYDRA agent working for Garrett, the real Clairvoyant.