Michael Sam and longtime boyfriend Vito Cammisano warmed hearts around the world when they locked lips after learning the football hunk was selected by the St. Louis Rams

on May 10, making him the first openly gay player drafted by an NFL team.

But football fans will be shocked to learn that the beloved University of Missouri grad’s main man has a dark secret: According to the Daily News, Cammisano is the grandson of late Mafia boss William “Will the Rat” Cammisano, notorious for allegedly killing enemies and dumping their bodies in sewers!

While the handsome former University of Missouri swimmer, 23, has no history of illegal activity himself, his grandfather was the boss of the Kansas City-based Civella crime family until his 1995 death. The elder Cammisano gained fame for refusing to speak about mob crimes in a 1980 Senate hearing.

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“I knew both from my father and others that Willie was called Willie the Rat because he killed people and stuck them in the sewers so the rats could eat them,” Fred Harvey Bonadonna, whose father was killed by the mob, testified at the hearing.