After officers attempted life-saving procedures, he was rushed to UMass Memorial-HealthAlliance Hospital where he was pronounced dead about an hour later.
The double murder charges were brought against Hernandez after he had been convicted of the shooting murder of an associate, Odin Lloyd, in 2013, in North Attleborough, Mass., near his home and the Patriots' Gillette Stadium.
Leslie Walker, of Prisoners' Legal Services of MA, told WBUR's Deborah Becker on Morning Edition that prisoners are monitored to prevent suicide. Hernandez was found hanging from a bed sheet in his cell at the maximum-security Souza Baranowski Correctional Center in Shirley, Massachusetts early Wednesday, according to corrections authorities. "Sometimes rounds are done more frequently, and I do not know how often, but regularly - half hour, hour".
Yet 10 months later, in 2013, with the discovery of the body of a friend who had been shot multiple times, Hernandez's life began a dramatic spiral downward.
Hernandez's shock suicide also came on the same day that his former teammates were honored at the White House for their recent Super Bowl win.
The District Attorney investigating the death said Hernandez's brain would be released to his family now that an investigation of the body by the Office of the Chief Medical Examiner had been completed.
"There's no indication he left a suicide note", Fallon said.
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"The family of Aaron Hernandez has made a decision to donate to this study so that we could possibly help other young men who decide to play football, and to help further that cause, and also possibly shed light and more evidence on this case", Baez said.
He told reporters Thursday that any time someone takes their own life in prison "something clearly went wrong".
One of his attorneys in that case, Jose Baez, issued a statement saying that his law firm would conduct its own examination into his Hernandez's death.
Family members of Aaron Hernandez are donating his brain to science so it can be studied for possible concussion-related damage.
Baez believes Hernandez may have been suffering from CTE caused by head injuries received during his football days.
Under a long-standing MA legal principle, courts customarily vacate the convictions of defendants who die before their appeals are heard. State police spokesman Dave Procopio also cites the "active" investigation.