A gunman who shot two Pennsylvania troopers at their barracks, killing one, has been formally sentenced to death. Frein was sentenced a day after a jury decided he should receive a lethal injection for the 2014 ambush in the Pocono Mountains. The gunman who shot two Pennsylvania troopers at their barracks, killing one, has arrived at a courthouse to be formally sentenced to death. A judge is scheduled to impose the death sentence on Eric Frein (freen) on Thursday after a jury decided he should receive a lethal injection for the 2014 ambush in the Pocono Mountains. The jury's decision that Frein should die by lethal injection brought a shout of "yes!" from a gallery that included high-ranking state police brass, the slain officer's mother and the trooper who suffered debilitating injuries after Frein shot him with a high-powered rifle.