Prison guards found Hernandez unresponsive in his cell at the Souza-Baranowski Correctional Center in Shirley shortly after 3 a.m.
The former New England Patriots tight end was pronounced dead at UMass Memorial-HealthAlliance Hospital in Leominster about an hour later.
He was in a single cell, according to the Department of Corrections. A statement from the correctional facility confirms that he hung himself from his cell window with a bed sheet.
Less than a week ago Baez was celebrating Hernandez's acquittal in the murder of two men outside a Boston nightclub.
In 2015, Aaron was sentenced to life in prison without the possibility of parole for the 2013 shooting death of his friend, Odin Lloyd.
State police were investigating the circumstances of the death of the former rising star in the National Football League, and a coroner was performing an autopsy on Wednesday, April 19.
Brian Murphy, president of Athletes First player agency and a representative of Hernandez, took to social media following the news of the ex-NFLer's death.
Cugno says he and other Hernandez pals can't believe he took his own life.
Baez tellsTMZ Sports that Hernandez's family is devastated and believes he was in a good space and wouldn't have taken his own life.
"Aaron was looking forward to an opportunity for a second chance to prove his innocence. Those who love and care about him are heartbroken and determined to find the truth surrounding his untimely death". From there, details started to come to the surface of a dark past filled with violence and drugs, stemming from his days in his hometown of Bristol, Connecticut that Hernandez couldn't leave behind. "I knew we had raised doubt throughout that case". He was acquitted on Friday of a 2012 double homicide in Boston.
Aaron Hernandez was serving a life sentence in prison.
As the Associated Press reported, prosecutors accused Hernandez of opening fire on their vehicle because he felt disrespected when one of the men bumped into him and spilled his drink at a Boston nightclub. In 2012, he signed an extension with New England worth $40 million.