Frein appears to have left notes after allegedly killing cop in Blooming Grove . Eric Frein , 31 , suspected in years ambush of 2 officers ; 2 died . Police say he planned attack for years .
Eric Frein appears to have left notes after allegedly killing cop in Pennsylvania . Frein , 31 , suspected in September 12 ambush of 2 officers ; 1 died . Police say he planned attack for years .