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Richard Abath.

Mr. Abath was one of the two guards on duty at the Isabella Stewart Gardner Museum early in the morning on March 18, 1990. He was the one who let the two robbers, disguised as police officers, into the museum.

Over the next hour and a half, the thieves stole more than a dozen works of art, including pieces by Edgar Degas, Rembrandt van Rijn, Édouard Manet and Peter Paul Rubens, cutting the works from their ornate wooden frames. They also took an ancient Chinese beaker and a bronze eagle finial from a Napoleonic-era flagpole.

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All together they took some $500 million in art, the equivalent of $1.2 billion today, making it by far the biggest art heist in history.
Suspicion immediately turned to Mr. Abath. City and federal investigators zeroed in on important details, like the coincidence of the thieves arriving so soon after the second guard left to make the rounds. A video camera outside the museum showed Mr. Abath briefly opening a side door not long before the robbery occurred.
Mr. Abath maintained his innocence throughout the rest of his life, and he was never named as an official suspect. He said that he regularly opened the side door to make sure it was locked and that while museum protocol forbade him from letting anyone in after hours, there was no contingency should the visitors be uniformed police officers.
“You know, most of the guards were either older or they were college students,” he told NPR in 2015. “Nobody there was capable of dealing with actual criminals.”

Brian Mulroney, former Canadian PM.