Technically, Hernandez is a free agent, but you won’t be able to sign him in Madden 25 if you need a Tight End for your squad.
Former #Patriots TE Aaron Hernandez has been removed from EA Sports games Madden and NCAA Football 14.
— Dov Kleiman (@NFL_RealUpdates) July 8, 2013
He was also supposed to be an unlockable player in NCAA Football 14, but EA will shut that down as well according to SB Nation.
Here is the statement they released.
We made a decision to remove Aaron Hernandez from Madden NFL 25 and NCAA Football 14. Because NCAA Football 14 was finalized prior to our decision, Hernandez’ image still appears in the Nike Skills Trainer. However, he is not in the game, and anyone who unlocks that particular Nike Skills Trainer reward will receive an Alex Smith Ultimate Team player item instead. The image of Hernandez will be removed via a Title Update in the near future.