▁the ▁third - de ad liest ▁attack ▁on ▁U . S . ▁law ▁enfor cement ▁since ▁the ▁September ▁ 1 1 ▁attacks , ▁following ▁a ▁ 2 0 1 6 ▁mass ▁shooting ▁in ▁Dallas , ▁Texas ; ▁and ▁a ▁pair ▁of ▁related ▁shoot ings ▁two ▁weeks ▁earlier ▁in ▁Oak land , ▁California . ▁ ▁On ▁June ▁ 2 8 , ▁ 2 0 1 1 , ▁Pop law ski ▁was ▁sent enced ▁to ▁death ▁by ▁le th al ▁injection ▁on ▁three ▁counts ▁of ▁murder ▁in ▁the ▁first ▁degree . ▁ ▁Sho ot ings ▁At ▁ 7 : 0 3   a . m . ▁ED T , ▁Offic ers ▁Paul ▁Sci ul lo ▁and ▁Stephen ▁May h le ▁of ▁the ▁Pitts burgh ▁Bureau ▁of ▁Police ▁respond ed ▁to ▁a ▁ 9 - 1 - 1 ▁call ▁from ▁Pop law ski ' s ▁mother ▁over ▁a ▁domestic ▁disturb ance . ▁ ▁When ▁the ▁officers ▁arrived ▁at ▁the ▁scene , ▁the ▁mother ▁answered ▁the ▁door , ▁explaining ▁that ▁she ▁wanted ▁Pop law ski ▁out ▁of ▁the ▁house . ▁As ▁the ▁two ▁officers ▁entered ▁the ▁home , ▁Pop law ski ▁was ▁reported ly ▁we aring ▁a ▁bullet proof ▁vest ▁and ▁" lying ▁in ▁wait ". ▁Sci ul lo ▁was ▁immediately ▁shot ▁in ▁the ▁head . ▁Al most ▁immediately ▁there after , ▁Officer ▁May h le ▁was ▁also ▁shot ▁in ▁the ▁head . ▁ ▁Officer ▁Eric ▁Kelly , ▁on ▁his ▁way ▁home ▁after ▁comple ting ▁his ▁over night ▁shift , ▁heard ▁the ▁call ▁for ▁help ▁and ▁arrived