Jackson was arrested and charged with simple assault nearly a year ago after allegedly punching the man, Jose Bonilla-Fuentes, on the left side of his face and back of his head in Washington, D.C., according to the Washington Post's Mark Lieberman.
Citing sources, Russini reported Bonilla-Fuentes is suing Jackson after the 32-year-old linebacker allegedly broke a bone in his face.
"I apologize for adding another distraction for this team," Jackson said in April, according to the Indianapolis Star's Stephen Holder. "I'm very fortunate to do what I do. I love what I do and I'm passionate. When the time allows, the facts will come out, but at this point, I want to apologize to the community and my fans and all my supporters out there."
Jackson—who has yet to face discipline under the NFL's personal-conduct policy—tallied 89 solo tackles and three sacks while appearing in all 16 games for the Colts last season.