JACKSON, MICH., DEC. 27 -- An inmate fatally stabbed one corrections officer and assaulted another today while he was being escorted to a shower at Southern Michigan Prison.

Tom Phillips, administrative assistant to the warden, said the incident took place about 7:50 a.m. in Cell Block 5 of the prison's Administrative Segregation Unit.

Two male guards were escorting a male prisoner from the unit when he assaulted one of the officers, then stabbed the other with an "ice pick-type instrument" in the neck and back, Phillips said.

Phillips said other guards quickly subdued the inmate and placed him into an isolation cell.

Both officers -- whose identities were being withheld -- were taken to W.A. Foote Hospital in Jackson. The assaulted officer was treated and released. The other guard was pronounced dead of multiple stab wounds, Phillips said.

"We believe the ice pick-type instrument was made from the handle of a mop bucket," Phillips said.

The guard's stabbing is the second killing of a corrections officer at Jackson this year. Josephine McCallum, a rookie guard, was raped and murdered by an inmate March 24. That incident sparked a debate over the safety of prison employes, especially women.

The maximum-security prison is the world's largest walled prison, with a prisoner population of about 5,600.