UTICA, N.Y. (AP) — A prosecutor told a jury Tuesday that three former upstate New York prison guards on trial in the fatal beating of a Black handcuffed inmate took part in an act of “sheer, unimaginable brutality.”

Mathew Galliher, Nicholas Kieffer and David Kingsley are charged with murder and first-degree manslaughter in the death of Robert Brooks, whose beating by guards at the Marcy Correctional Facility on Dec. 9 was captured in part on body-camera footage. The trio were among 10 corrections officers indicted in February on murder charges or for lesser crimes.

Onondaga County District Attorney William Fitzpatrick told jurors in his opening statement that they would view sickening videos of Brooks’ treatment by a group of guards, and that each of the defendants was involved.

“They

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