Mob boss Francis ‘Cadillac Frank’ Salemme dies in prison aged 89

The Boston mobster died in a federal prison in Missouri from an undetermined cause

The once formidable New England mob boss Francis Cadillac Frank" Salemme has died in prison while serving a life sentence for the 1993 killing by strangulation of a Boston nightclub owner, according to authorities. He was 89.

Salemme died on 13 December, online records from the US Bureau of Prisons show. The local news outlet WPRI first reported Salemme's death late on Sunday, though a cause was not immediately available.