- His girlfriend was hit on by Charlestown mobster Georgie McLaughlin in 1961, setting off the Boston Irish gang war of the early 1960s. Rocco himself was picked up as a suspect in the murder of Bernie McLaughlin, but never charged.
- Wife Sandie E. Rocco was a former professional square dancer and night club performer who later became a screenwriter. She died at age 59 after a four-year battle with cancer on June 12, 2002.
- Was once a member of The Winter Hill Gang.
- Debuted on Batman (1966) as a thug who gets "Whapped" by the Caped Crusader.
- Starred in the February 3, 2008, Super Bowl ad for Audi that parodied the famous "horse head" scene in The Godfather (1972).
- A member of the Bahá'í faith.
- At his marriage to Sandie Garrett in 1966, he adopted her son, Marc, who became known as Marc Rocco.
- Three children: director Marc Rocco; Jennifer Rocco, an attorney; Lucien Rocco, a poet; and, his grandson, Anthony Dominic Alessandro, son of Jennifer Rocco.
- He died on the same day as his The Entity (1982) co-star George Coe: July 18, 2015.
- His "Do you know who I am" line in The Godfather (1972) is often used by Howie Carr when the subject is the "Beautiful People" getting in trouble.
- His son, Marc Rocco, preceded him in death, on May 1st, 2009.
- Stepfather of Kelli Williams and Sean Doyle.
- His last name is pronounced as "roe-coe".
- Second husband of Shannon Wilcox.
- Father-in-law of Lisa Rocco.
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