Federal prosecutors say an inmate's killing of a guard at a federal prison in Pennsylvania was a calculated slaying during which the inmate paused to chew a piece of gum he took from the dying guard's pocket.
Prosecutors detailed the attack in court documents filed Monday, arguing that a jury should see surveillance video showing the nine-minute attack and 22-minute aftermath in which guard Eric Williams lay dying before other guards arrived.
Jessie Con-ui is charged in the February 2013 stabbing death of Williams at the Canaan federal prison in Waymart.
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Defense attorneys don't dispute he killed Williams. But they're opposing the death penalty and say the stabbing was retaliation for mistreatment by guards, not the calculated slaying prosecutors contend.
A ruling on the video evidence is pending.