A Pennsylvania prosecutor is formally notifying the court he's seeking the death penalty for a man accused of killing one state trooper and wounding another in a barracks ambush.

Pike County District Attorney Ray Tonkin filed a document Tuesday listing aggravating circumstances that could send Eric Frein (freen) to the state's death row.

Frein's formal arraignment is scheduled for Thursday at the courthouse in Milford, but Tonkin says he expects Frein to participate by video from the Pike County Correctional Facility.

Defense attorney Michael Weinstein is declining to comment on the death penalty filing and says his client intends to plead not guilty at the arraignment.

Frein is charged with first-degree murder and other offenses in the September ambush that killed Cpl. Bryon Dickson and severely wounded Trooper Alex Douglass.