Fiancee of Aaron Hernandez testifies in his double-murder trial

Shayanna Jenkins-Hernandez, fiancee of former New England Patriots player Aaron Hernandez, testifies in Suffolk Superior Court during his murder trial Thursday. (Josh Reynolds /The Boston Globe via AP, Pool)

Former NFL star Aaron Hernandez's fiancee testified in his double-murder trial Thursday that she learned to keep her mouth shut and "not to ask any questions" in certain situations.

Shayanna Jenkins-Hernandez testified against Hernandez under a grant of immunity from prosecutors. She and Hernandez have a 4-year-old daughter. She said she took Hernandez's last name in 2015.

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Hernandez, a former tight end for the New England Patriots, is accused of fatally shooting two men in Boston in July 2012 after an encounter at a Boston nightclub. He is also charged with witness intimidation in the shooting of Alexander Bradley, allegedly to silence him about the killings.

Jenkins-Hernandez repeatedly said she could not recall details about conversations with Hernandez after the 2012 killings and after Bradley's shooting in 2013.

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She said she didn't ask Hernandez for details about Bradley's shooting, even though Hernandez and Bradley were close friends.

"He was not my friend. ...Yes, it's a sad situation (but) why should I press about something like that?" she said.

Jenkins-Hernandez also said she did not recall getting a call from Hernandez at 2:37 a.m. on July 16, 2012, minutes after prosecutors say Hernandez shot Daniel de Abreu and Safiro Furtado as they sat in a car at a stop light in Boston. Prosecutors said phone records show a 17-second call from Hernandez to her at that time.

Hernandez has denied shooting the men. His lawyer told the jury during opening statements that Bradley shot the men over a drug deal.

Bradley testified he saw Hernandez shoot the men. He also said Hernandez shot him in the face months later after he made a remark about the Boston shootings.

Hernandez is already serving a life sentence after being convicted in the 2013 killing of a man who was dating the sister of Jenkins-Hernandez.