He tried to jam the cell door to prevent guards from opening it and hanged himself with a bedsheet tied to a window, Fallon said.
The attorney is calling for a "transparent and thorough investigation" into the death of his client. Hernandez was serving a life sentence for the 2013 murder of an acquaintance but on Friday had been found not guilty of killing two other people.
"Life-saving techniques were attempted on Hernandez and he was transported to hospital where he was pronounced dead at 4.07am", its statement added.
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In a statement Wednesday, Jose Baez's office said "those who love and care about him are heartbroken and determined to find the truth surrounding his untimely death".
Less than a week ago Baez was celebrating Hernandez's acquittal in the murder of two men outside a Boston nightclub. Now that Hernandez is dead from an apparent suicide, however, the state of MA will no longer deem him guilty of that crime.
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The department said the former NFLer was in a single cell in a general population unit. An autopsy has been scheduled to determine the exact cause of death. Quinn calls Hernandez's death "a shocking and sad end to a very tragic series of events that has negatively impacted a number of families".
A star tight end for the University of Florida when it won the 2008 title, Hernandez dropped to the fourth round of the National Football League draft because of trouble in college that included a failed drug test and a bar fight. "I knew we had raised doubt throughout that case".
Hernandez played three seasons for the team before he was arrested and charged with murder in the 2013 shooting of Odin Lloyd, who was dating his fiancee's sister. Aaron blew kisses and waved at the four-year-old as she waved back and cried. Furthermore, officials said Hernandez did not seem suicidal, because if so, he would've been transferred to a mental health unit. "Mr. Hernandez also attempted to block his door from the inside by jamming the door with various items".
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Legislators in MA have made attempts over the years to close the loophole where death leads to expungement in a case under appeal. Patriots spokesman Stacey James said: "We are aware of the reports but I don't anticipate that we will be commenting today".