A judge entered a not-guilty plea for David Sweat at his arraignment Thursday in Plattsburgh on two felony counts of first-degree escape and a charge of promoting prison contraband.
Sweat escaped June 6 from Clinton Correctional Facility with fellow inmate Richard Matt. Matt was shot dead June 26, and Sweat was shot and captured two days later.
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The prisoners used power tools to saw through steel cell walls and steam pipes to reach a manhole outside the prison.
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The 35-year-old Sweat is already serving life without parole for the killing of a sheriff's deputy.
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Sweat was hospitalized after his capture and then sent to a different prison.