It was some throwaway scene in Chuck...
"Agent Graham was killed during the events of "Chuck Versus The First Date" when the replacement Intersect exploded due to Fulcrum sabotage"
link
Yeah..then...I think that was the first episode of the second season. In september.
edit: He was in Redemption as well. "General Juma"
edit edit: He was also Worfs brother on Star Trek (too much?)