A 70-year-old state prisoner died Wednesday after he was assaulted by another inmate at Halawa Correctional Facility, according to a prison spokeswoman.

Toni Schwartz, public information officer for the state Department of Public Safety, said in a written statement that staff were alerted to a reported inmate-on-inmate assault at Halawa at 10:15 a.m. Wednesday.

The elderly inmate, who was not publicly identified, was taken by ambulance to a nearby hospital and was pronounced dead at 11:34 a.m., according to the statement.

Schwartz said the incident is under criminal and administrative investigation.

Halawa is the state’s largest prison, and was holding 886 inmates as of Monday.