92 Vernon Butler DT

The Panthers declined to exercise the fifth-year option on Butler's contract, Mike Garafolo of NFL Network reports.

That means the 2016 first-rounder will become an unrestricted free agent at the end of the league year. Arguably the Panthers' worst draft pick in the Dave Gettleman era and a player who was supposed to lift a Carolina defense that had just let Josh Norman walk in free agency, Butler has accrued just 45 tackles and two sacks through three seasons despite playing alongside some talented teammates.

Butler was recently accused of assaulting a woman at a club in Dallas, David Newton of ESPN.com reports.

Butler reported to Panthers training camp Wednesday, less than 24 hours after the accusation became public. Charges haven't been filed, as police are still in the process of investigating.