Popsugar Entertainment Game Of Thrones Who Killed Joffrey on Game of Thrones? Who Killed Joffrey? An Update April 21, 2014 by Laura Marie Meyers View On One Page Photo 7 of 7 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 7 Melisandre Why it could be her: Melisandre's spell last season using Gendry's blood and leeches put hexes on Renly Baratheon, Robb Stark, and Joffrey — all of whom are now dead. Why it couldn't be her: Do we really believe in her magic? Previous Next Start Slideshow Game Of ThronesTV