Smith announced his retirement from the NFL via Twitter on Friday.
The Panthers released Smith on Sunday, Adam Schefter of ESPN reports.
Smith has been targeted three times while featuring in two of the Panthers' three preseason contests so far.
Smith (knee) was removed from the preseason PUP list Saturday, Greg Newton of ESPN.com reports.
Smith (knee) will open training camp on the Panthers' preseason PUP list, Jourdan Rodrigue of The Athletic reports.
Smith is dealing with a knee injury, Jourdan Rodrigue of The Charlotte Observer reports.
Smith is rehabbing from an undisclosed injury, Jourdan Rodrigue of The Charlotte Observer reports.
Smith agreed to a restructured contract with Carolina that will pay him $2 million in 2019, Field Yates of ESPN reports.
The Panthers picked up Smith's contract option for 2019, Max Henson of the Panthers' official site reports.
Smith finished the 2018 regular season with 17 catches on 30 targets for 190 yards and two touchdowns in 11 games played.