While working for the Irish Mob, Niko befriends gangster Patrick McReary and helps him and his brothers carry out a bank robbery. Niko is later hired by Ray Boccino, a "caporegime" in the Pegorino crime family, to oversee an important diamond deal, which goes awry. Boccino repays Niko by helping him find ex-comrade Florian Cravic, now known as Bernie Crane, who claims that he did not betray their unit; Niko concludes that the traitor was Darko Brevic. Niko continues working for the Mafia in Liberty City, and eventually earns the trust of Don Jimmy Pegorino after killing Boccino, who was suspected of being a police informant. Niko also helps Patrick kidnap Don Giovanni Ancelotti's daughter to ransom her for the diamonds, but the exchange is intercepted by Bulgarin and the diamonds are ultimately lost.