Ratko is a Serbian thug who works as a butcher at Beneficio's Gourmet Market. When luxury food importer, Henry Morgenthau visited the market to try to sell hams, Ratko noted that the meats would be worth a lot of money. He broke into Morgenthau's apartment to steal a ham, but was surprised when he realized that Morgenthau is at home. Ratko murdered Morgethau and stole the ham.
Later, Jake and Charles come to question Ratko at his place of work. Ratko claims to not know who Morgenthau is, but when Jake reveals his theory on the murder, Ratko attacks them by throwing ham at them, before Jake outwits him. The two of them engage in a violent brawl, before Ratko outruns the cops.
While searching through old case files, Jake comes across several references to a thug nicknamed "The Rat" and "The Butcher." The thug is said to hang out at a storage unit near Boerum Park. With this information, the detectives stake out the storage units and as a team they are able to arrest Ratko.