CHICAGO — A 73-year-old Chicago man — famous for his role in helping to steal the 45-carat Marlborough Diamond from a London jewelry store three decades ago — has been convicted of racketeering.

Federal Judge Harry Leinenweber found Arthur "The Brain" Rachel guilty Thursday on three of four counts, including racketeering. Rachel grimaced and shook his head slightly when the judge read the verdicts.

Two co-defendants had pleaded guilty earlier.

The case drew attention partly because of the defendants' advanced ages when they're accused of planning several apparently botched robberies.

Rachel was imprisoned in Britain in the diamond theft. The diamond was never recovered.