Connor was behind bars at the time of the Gardner heist--for another art heist--but claimed he could locate the art if released.

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Many view this as the single greatest art heist of all time.

CNN: FBI: We know who was behind massive 1990 Boston art theft

Police in Romania have detained three suspects linked to a major art heist, which took place at a Dutch art gallery last October, officials say.

BBC: Rotterdam Dutch art thefts lead to Romania arrests

Last year, a federal prosecutor in Connecticut revealed that the FBI believed a reputed Connecticut mobster, Robert Gentile, had some involvement with stolen property related to the art heist.

NPR: FBI Focuses On Recovering Art Stolen In Mass.

The precipitating event is an art heist gone awry.

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But an art heist was not the reason.

CNN: Thieves force Louvre to shut its doors

It stars James McAvoy as an art auctioneer who becomes involved in a heist.

BBC: Underworld star returns to write for Danny Boyle film