Thompkins (hamstring) signed with the Panthers on Thursday, Darin Gantt of the team's official site reports.
The Buccaneers waived Thompkins with an injury settlement in early June, and now that he's past his hamstring issue, the third-year wide receiver has decided to follow his former offensive coordinator, Dave Canales, to Carolina. Thompkins has served primarily as a return man during his time in the NFL, so he'll likely be competing with Ihmir Smith-Marsette and Raheem Blackshear for the the Panthers' top kick and punt returner spots as the offseason progresses.