Miami Dolphins center Mike Pouncey was served a subpoena related to the Aaron Hernandez investigation less than an hour after the Dolphins' loss to the New England Patriots on Sunday.
Massachusetts State Police served Pouncey with a grand jury subpoena at Gillette Stadium.
Pouncey was a teammate of Hernandez at the University of Florida. Hernandez, a former Patriots tight end, is accused of murder. Authorities are also looking into Hernandez's potential involvement in interstate gun trafficking in Florida, Massachusetts and New York.
Multiple media outlets reported that police are focusing on several transactions that involve Pouncey and Hernandez.
The Dolphins said they would not comment and added that Pouncey would not comment.
The subpoena does not mean that Pouncey will be charged with a crime. He is considered a material witness who could potentially strengthen the case against Hernandez.
Two Massachusetts State Police officers approached Pouncey near the visitors' locker room and handed him the subpoena.
"What's this about?" Pouncey was heard asking when he received the piece of paper, according to SI.com.
A Patriots official said team owner Robert Kraft was not informed that Pouncey would be served the subpoena.
Hernandez is in jail awaiting trial on first-degree murder charges in the shooting death of Odin Lloyd.
Pouncey and his twin brother, Maurkice, a center with the Pittsburgh Steelers, were close friends with Hernandez in college. Photos of the Pounceys wearing hats that read "Free Hernandez" surfaced on the internet during the summer. Maurkice later apologized but Mike did not.
When asked by SI.com if Maurkice Pouncey was served a subpoena, the Steelers declined to comment.