15. Aaron Hernandez
The New England Patriots dynamic duo of Aaron Hernandez and Rob Gronkowski was an absolute nightmare for opponents. While Gronkowski resembled more of the classic smash-mouth tight end, Hernandez was athletic enough to line up at almost any position on the field. Even the best defensive coordinators in the NFL struggled to come up with a game plan for stopping Hernandez and Gronkowski. But eventually, Hernandez’s checkered past — starting with his days as a member of the University of Florida Gators — caught up with him.
In June of 2013, Hernandez was arrested and charged with first-degree murder, in addition to five gun-related charges, in the death of Odin Lloyd. To their credit, the Patriots released Hernandez within 90 minutes of his arrest. Hernandez was found guilty of all charges, and sentenced to life in prison without parole, ending any chance of him ever playing football. (Image Credit: Getty)