FALL RIVER, Mass. (AP) — A closed-door hearing has concluded for an anonymous tipster who raised questions about the integrity of one of the jurors who convicted former New England Patriots player Aaron Hernandez of murder.

Hernandez was allowed to attend Friday's hearing, but the public was not.

Outside court, prosecutors and Hernandez's lawyers said they couldn't comment, citing a gag order.

The tipster and the juror haven't been publicly identified.

A lawyer for Hernandez says the tipster called him after Hernandez was convicted in June of the 2013 killing of Odin Lloyd. The tipster told him the juror knew about a double murder in Boston that Hernandez is charged with. Mention of that case was barred at trial.

Prosecutors question the tipster's credibility. They say she wrote sexually explicit letters to Hernandez in jail.