"We're just hoping for justice," cousin Marsha Martin said. "We don't want Odin to have died in vain."
Hernandez's attorney Michael Fee has acknowledged media reports about the state police search of his Hernandez's home but said he wouldn't have any comment on it.
Attleboro District Court clerk magistrate Mark E. Sturdy said three search warrants were issued in the investigation earlier in the week but have not been returned, meaning they're not public. He said no arrest warrants had been filed in state courts by the time court closed at 4:30 p.m. Friday.
Hernandez was gone from his home for most of the day Friday, including when two state police officers knocked on his door. He returned home with his attorney around 5 p.m.
Patriots spokesman Stacey James has said the team does not anticipate commenting publicly during the police investigation. NFL Commissioner Roger Goodell was waiting for the legal process to take its course.
CytoSport, a Benicia, Calif.-based company that makes Muscle Milk and other supplements for athletes, said Friday it was ending Hernandez's endorsement contract, effective immediately, because of the investigation.
The Patriots drafted Hernandez out of Florida in 2010. Since then, he has combined with Rob Gronkowski to form one of the top tight end duos in the NFL. He missed 10 games last season with an ankle injury and had shoulder surgery in April but is expected to be ready for training camp. Last summer, the Patriots gave him a five-year contract worth $40 million.
Hernandez said after he was drafted that he had failed a drug test while with the Gators and had been upfront with NFL teams about the issue.
Earlier this week, a man filed a lawsuit in South Florida claiming Hernandez shot him in the face after they argued at a strip club there.
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.
A spokeswoman for the Palm Beach County sheriff's office said Friday that investigators would need to speak with Bradley to move forward with a criminal investigation and cannot rely on the claims he made in his lawsuit. The spokeswoman, Teri Barbera, said Bradley repeatedly refused to cooperate in the criminal probe after he was shot in February, telling detectives he didn't know who shot him.
Hernandez's attorney did not respond to a request for comment on the lawsuit.