PHILADELPHIA (WPVI) -- We are learning new details about the brutal attack on a corrections officer at a Philadelphia prison.
Police have identified the suspect as Tarrell Rister.
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The attack happened Sunday inside the Curran-Fromhold Correctional Facility in Holmesburg.
Investigators say the 51-year-old officer was attempting to lock Rister in his cell when he was knocked unconscious.
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Rister now faces several charges, including attempted murder, aggravated assault, and assault by prisoner.
He was behind bars awaiting a retrial of a 2017 murder case.