Reputed Chicago mob boss convicted in the murders of the organization's Las Vegas link and the man's brother has been sentenced to life in prison.U.S. District Judge James B. Zagel sentenced James Marcello on Thursday after a federal jury held him responsible for the deaths of Tony "The Ant" Spilotro and his brother Michael. Tony was the inspiration for Joe Pesci's character in the movie "Casino."Marcello was convicted in September 2007 with four others in the landmark Operation Family Secrets trial.Zagel says Marcello had to pay for his crimes.Marcello declined to address the court before he was sentenced.Former police officer Anthony Doyle is the last defendant convicted at the trial who has yet to be sentenced.