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The Indiana State Prison in Michigan City.

MICHIGAN CITY — A Gary man serving time for the slaying of a grandmother and aunt of a Gary police officer was stabbed to death Wednesday at the Indiana State Prison, a facility spokeswoman said.

A suspect in the case was placed in a restrictive housing unit pending the outcome of the investigation and possible charges, said Pam James, spokeswoman for the prison.

According to prison officials, Willie Steele, 49, was doing some facility work in an area of the prison usually reserved for offenders who have violated prison rules.

He was stabbed once in the torso and found at 4:33 a.m. by a correctional officer, James said.

He was pronounced dead about three hours later at Franciscan Health Michigan City, officials said.

James said what led to the stabbing is still being pieced together.

The identity of the suspect was not released. Charges hinge on the outcome of the ongoing investigation by the LaPorte County prosecutor's office, Indiana State Prison and prison investigators, James said.

Steele was serving a 65-year sentence after he pleaded guilty to slaying Lillie Miller and her daughter Donessa on Oct. 30, 2009.

The women were the grandmother and the aunt of Gary police patrolman Damon Bradshaw.