Shamrock was Stringer Bell's second in command while Avon Barksdale was in prison and oversaw the technical aspects of the drug operation on his behalf. Stringer sounds out his loyalty by having him followed on a trip to Philadelphia to collect a package of drugs, along with Bodie Broadus. The package is not delivered correctly, but Shamrock and Bodie keep to Stringer's orders and meticulously documented his progress, and Stringer is satisfied with their response.