A Boston man who has spent more than 30 years in prison for a killing he says he didn’t commit has an unusual ally in his quest to exonerate himself — convicted mobster James “Whitey” Bulger.

Robert LaMonica was gunned down in Braintree in 1980. Fred Weichel, now 62, was convicted the following year based largely on testimony from a teenager who said he saw the gunman jump into a waiting car and identified him as Weichel.

The Boston Globe reports that in a series of letters sent from jail last fall, Bulger wrote that the real killer was an unnamed friend of Weichel’s.

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Bulger says he’s familiar with the slaying because he played an indirect role in it.

Weichel’s lawyer shared the information with the Globe.