Nick Bosa’s great-grandfather was a different type of hit man.

The former Ohio State defensive end comes from a family of NFL players. His brother Joey is a defensive end and former first-round pick for the Los Angeles Chargers. And Bosa’s father and uncle were both first-round draft picks who played three years each in the NFL.

But Bosa’s great-grandfather, Tony Accardo, made a name for himself in a more violent way — as a notorious Chicago mafioso.

Accardo started out as a bodyguard for Al Capone during Prohibition and later had his own 40-year reign as a Windy City mob boss.

Accardo gained a reputation as a brutish hit man for his work with Capone, who started calling him “Joey Batters” after he allegedly killed three men with a baseball bat.

He was also said to have been involved with Chicago’s infamous St. Valentine’s Day Massacre in 1929, but the case was never officially solved.

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Accardo established his own crew after Capone was arrested for tax evasion in 1932. He became the outfit’s underboss a decade later before taking over as boss in 1947.

The mobster, who was often called “The Big Tuna” in the media, was so infamous in Chicago that teams were concerned about drafting Bosa’s uncle, Eric Kumerow, in 1988, according to the Chicago Tribune.

Accardo died in 1992 as a result of heart and lung diseases. He was 86.

“I’ve only heard amazing things about [Accardo],” Joey told the Chicago Tribune before his own draft in 2016. “Wish I could have spent some time with him before he passed.”

But Nick has kept quiet on the subject, telling TMZ in 2016: “That’s not something I should really be talking about.” The expected first-round pick left Ohio State early to prepare for the NFL draft.

Considered one of the top players in college football last season, Bosa suffered a core muscle injury in September and had surgery five days later.

He is expected by many to be selected second overall if the Arizona Cardinals take Oklahoma quarterback Kyler Murray with the No. 1 pick.