Eleven staff members have been placed on administrative leave pending an investigation into Saturday’s death of New York prison inmate Messiah Nantwi, the State Department of Corrections and Community Supervision said in a release Monday.

The New York State Department of Corrections said the 22-year-old prisoner was housed at Mid-State Correctional Facility and died Saturday.

New York state police are investigating the death of an inmate as the state corrections system continues to be roiled by a wildcat strike by prison staff. The agency said Monday it had launched a probe into the death of Messiah Nantwi at Mid-State Correctional Facility.