BOSTON -- A lawyer for mobster James "Whitey" Bulger has asked to delay the start of his trial by a year, arguing he needs more time to explore evidence prosecutors plan to use against him.

Bulger, the former leader of the Winter Hill Gang, is accused of participating in 19 killings. He was also an FBI informant who gave the agency information on the rival New England Mob.

The 82-year-old gangster was apprehended in California last year after 16 years on the run. His lawyer, J.W. Carney Jr., has repeatedly said he cannot be ready by Nov. 5, the current trial date.

On Wednesday, Carney argued in court papers that the voluminous evidence in the case will take until May 2013 to review. He asked for a Nov. 4, 2013, trial.