Fairfax County Commonwealth's Attorney Ray Morrogh says he will not bring criminal charges against jail deputies who used a stun gun on a restrained inmate who later died.

Morrogh released a report Tuesday calling the death of 37-year-old Natasha McKenna a "tragic accident." He had been evaluating whether to bring charges for the past two months.

McKenna, who was African-American, died in February, days after a team of deputies used a hood and a stun gun on McKenna while she was in restraints during a cell transfer. McKenna had a history of mental illness and had previously attacked a deputy.

A medical examiner had previously ruled her death accidental.

Her death remains the subject of a federal civil rights investigation.