Say hello to Mr. July 2014, Aaron Hernandez. Oof.
This is one of those things that seems absurd right now, but you have to remember, when it was actually getting made and approved, Aaron Hernandez had not been charged with murdering three people. In fact, he might not have even allegedly murdered three people yet. He may have only allegedly murdered two people, unbeknownst to all of us.
Florida's football twitter account seems to acknowledge the calendar is legitimate, but rightfully points out how it's just a terrible situation.
Hernandez was charged with the murder of Odin Lloyd on June 26, 2013. The next day we learned he was also being investigated for a July 2012 double-homicide in Boston. Maybe someone, somewhere should have remembered that they approved a calendar with an alleged murdered a few weeks earlier—if the spring 2013 timeframe is accurate—but that's a pretty small nit to pick.
Every single thing about this is totally understandable. Still, you can buy a Florida Gators calendar with an alleged murderer in it in Target. Yikes.