Authorities say Hernandez is no longer cooperating with police in connection with a murder investigation.
Sources told ABC News that the security system at Hernandez's home had been intentionally destroyed, and his cellphone was handed over to police "in pieces."
Hernandez has not been ruled out as a suspect in the killing of 27-year-old Odin Lloyd. Police want to know why house cleaners were hired on Monday to scrub Hernandez's mansion, sources said.
Surveillance video from Monday appears to show the 27-year-old football player with Lloyd, who was later found shot to death just a half mile from the player's home, investigators said. Police have searched in and around Hernandez's sprawling home in North Attleborough.
"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."
Family members said 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. There is also evidence that the two men were together at several nightclubs over the weekend, law enforcement told ABC News.
Because of the growing investigation into Hernandez, CtyoSport, which makes the Muscle Milk line of supplements, fired him as an endorser on Friday.
Earlier this week, a 30-year-old man filed a lawsuit in South Florida claiming Hernandez shot him in the face after they argued at a strip club. Alexander Bradley's lawsuit accuses Hernandez of negligence, among other things, suggesting that the shooting may have been accidental. Bradley said he lost his right eye and suffers many other lingering effects from the shooting.
ABC News and The Associated Press contributed to this report.
