FALL RIVER, Mass. -- A lawyer for former New England Patriots player Aaron Hernandez is asking a judge to let him question under oath a woman who called him anonymously and raised questions about a member of the jury that convicted his client of murder.

James Sultan told the judge Monday that he had identified the tipster who told him a juror may have been "untruthful" during jury selection.

Her name is redacted in filings the court released Tuesday, but Sultan says she has had extensive personal contact with Hernandez since he was arrested for the 2013 killing of Odin Lloyd. He was sentenced to life in prison without parole for first-degree murder.

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Sultan says there is reason to believe the tipster has relevant information.

Prosecutors have until Friday to respond.