Gay was fined Friday for unnecessary roughness because he unnecessarily delivered a forcible blow to the head and neck area of Campbell.
Miami defensive end Cameron Wake drew the same fine amount for roughing the passer when he hit Carolina's Cam Newton in the head and neck area.
Also fined for Sunday was Saints defensive end Cam Jordan, docked $10,000 for a hit on Falcons QB Matt Ryan.
Lions DT Ndamukong Suh was fined $7,875 for motioning a throat slash in a game with Tampa Bay. Jets DT Kenrick Ellis was fined $7,875 for unnecessary roughness when he grabbed Baltimore QB Joe Flacco's face mask.
Bears guard Kyle Long was docked the same amount for unnecessarily striking a Rams opponent during a skirmish involving several players.
AP NFL website: http://www.pro32.ap.org