Detective Conway (Mark Derwin) , first seen in "Chuck Versus the Marlin", is the name of the detective who was in charge of investigating the break in at the Burbank Buy more where all the products, shelves and everything else was stolen overnight. Conway told Big Mike that he though it was an inside job and interrogated the Buy More employees.
It is revealed to the viewer that it was the CIA and NSA who stole the content of the Buy More after John Casey found a unknown bug in the Buy More which could have recorded evidence that Chuck Bartowski is the governments Human Intersect that Fulcrum had been looking for.
Since the bug was short range it would need another device close by to backup to, which is why the CIA/ NSA took the entire content of the Buy More in order to search it.
It is revealed that Conway is a CIA agent named Longshore, probably knowing who stole the content of the Buy More from the start, when he is ordered by Beckman to extract Chuck and take him to a CIA bunker due to the fact that his identity may have been revealed to Fulcrum.
Conway is shot and killed by Lizzie Shafai when she ambushes Sarah Chuck and Longshore at the extraction point.