While serving the life sentence in a MA prison, double homicide charges were also brought against him for the 2012 murders of Daniel Abreu, 29, and Safiro Furtado, 28.
Lifesaving techniques were administered to the former New England Patriots tight end and he was rushed to a hospital, where a physician pronounced him dead at approximately 4:07 am (0807 GMT). Prosecutors in the double-murder trial weren't allowed to mention his conviction in Lloyd's case.
But the team released him in 2013 after he was arrested in the killing of Odin Lloyd, a semi-professional football player who was dating the sister of Hernandez's fiancee. Police are at the scene and an investigation is underway. Now, the his former agent is saying there's "absolutely no chance he took his own life".
He appears to have hanged himself by attaching a bed sheet to the window of his single cell.
Fallon said he's not aware of any suicide note written by Hernandez and stressed that an investigation is ongoing.
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Hernandez had reportedly "attempted to block his door with various items", according to the statement. Otherwise, he would have been transferred to a mental health unit, Fallon said.
Committed to play at the University of CT, but changed to the University of Florida to play under Urban Myer.
Sources say investigators believe one of the last people to see Hernandez is a close friend who is now in isolation on what is called "eyeball suicide watch".
Once the news broke, National Football League agent Brian Murphy, who once represented Hernandez with the agency Athletes First, jumped to his Twitter account to dismiss the official cause of death.
His former Patriots teammates visited the White House and met with President Donald Trump on Wednesday in honor of their Super Bowl win. A team spokesman said the trip would proceed and declined to comment further on Hernandez's death.
His suicide was "a shocking and sad end to a very tragic series of events that has negatively impacted a number of families", Bristol County Attorney Thomas Quinn, who prosecuted Hernandez in the murder case that resulted in his life sentence, told the AP.