Police have searched in and around Hernandez's sprawling home in North Attleborough, not far from where the Patriots practice. The Bristol County district attorney has not released any information other than saying the death of 27-year-old Odin Lloyd is being treated as a homicide.
Massachusetts authorities are expected to execute an arrest warrant at some point for Hernandez for obstruction of justice in connection with a homicide investigation, sources told ABC News on Friday.
A jogger found Lloyd's body in an industrial park Monday. Family members said Friday that Lloyd was dating the sister of Hernandez's girlfriend and the two men were friends who were together at some point the night that Lloyd died.
Family members have said Lloyd, a semi-pro football player, was never in trouble and that many things are puzzling about the case. But they also said Friday that they can see progress in the investigation.
"I want the person that killed my son to be brought to justice," said Lloyd's mother, Ursula Ward. "That's my first-born child, my only boy child, and they took him away from me. ... I wouldn't trade him for all the money in the world. And if money could bring him back I would give this house up to bring my son back. Nothing can bring my son back."
Hernandez attorney Michael Fee has acknowledged media reports about the state police search of his client's home but says he wouldn't have any comment on it.
Mark E. Sturdy, clerk magistrate of Attleboro District Court, said three search warrants were issued in the investigation earlier in the week, but they have not yet been returned, meaning they're not public. He said no arrest warrants had been filed in state courts as of Friday morning.
Lindsay Lague, a spokeswoman for the police department in Providence, R.I., said officers had assisted Massachusetts police with the Hernandez investigation at a Providence strip club, but she could not say what they were doing there. A woman who answered the phone Friday afternoon at the business, Club Desire, said no one was available to answer questions.
Information from The Associated Press was used in this report.