A woman who served on the grand jury as part of the high-profile investigation into Karen Read -- who was acquitted of murder charges last month in the death of her boyfriend -- agreed to plead guilty to a federal charge she leaked information from the secret proceeding, according to a court document filed Tuesday.

Read, 45, on June 18 was acquitted by a jury of killing her boyfriend, Braintree native and Boston police officer John O'Keefe.