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CROWLEY, COLO. -- Colorado Department of Corrections officials have released the name of the woman killed by a prisoner Monday morning.

Officials said 55-year-old Sgt. Mary Ricard was preparing breakfast in the Arkansas Valley Correctional Facility's kitchen early Monday morning when an incident started involving a prisoner.

Ricard was killed and another staff member, Sgt. Lori Gann, was seriously injured and remains at a hospital.

All Colorado prisons were put on lockdown, and meals were prepared and delivered from the outside.

Authorities identified the inmate responsible but did not release his name.

The prison, which is about 45 miles east of Pueblo, has about 1,000 male inmates.