An individual pleaded guilty but mentally ill Monday to killing an off-duty state police agent last year along the Montour Trail in Moon.

Nearly a dozen of Benjamin Braillier’s friends and family members sat in the courtroom as 26-year-old Antonia Quesen pleaded guilty but mentally ill to one charge of third-degree murder and several lesser charges in a separate case. A plea of guilty but mentally ill means that, upon sentencing, Quesen will be sent to a facility that can continue to treat her mental health conditions.

Sentencing is set for Nov. 18.

Mr. Braillier, 44, was running on the Montour Trail mid-afternoon on Oct. 21, 2024 when prosecutors said he encountered Quesen, who was living in the woods along the trail.

Attorneys for Quesen told Common Pleas Judge Edward J. Borkowski sh

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