▁over ▁the ▁Central ▁Ar tery / Th ird ▁Har bor ▁T unnel ▁Project ▁( Big ▁Dig ) ▁from ▁ 2 0 0 2 ▁to ▁ 2 0 0 6 . ▁The ▁Massachusetts ▁Turn pi ke ▁Author ity ▁is ▁the ▁ag ency ▁that ▁was ▁in ▁charge ▁of ▁the ▁Big ▁Dig ▁project . ▁ ▁After ▁the ▁collapse ▁of ▁a ▁portion ▁of ▁the ▁roof ▁of ▁the ▁I - 9 0 ▁Con ne ctor ▁T unnel ▁on ▁July ▁ 1 0 , ▁ 2 0 0 6 ▁in ▁which ▁ 3 8 - year - old ▁Mil ena ▁Del ▁Valle , ▁of ▁J ama ica ▁P lain , ▁was ▁killed , ▁Massachusetts ▁Governor ▁Mitt ▁Rom ney ▁called ▁for ▁Am or ello ' s ▁res ignation . ▁On ▁July ▁ 2 7 , ▁ 2 0 0 6 , ▁Am or ello ▁agreed ▁to ▁res ign , ▁effective ▁August ▁ 1 5 . ▁ ▁Rom ney ▁p inned ▁much ▁of ▁the ▁bl ame ▁for ▁the ▁collapse ▁on ▁the ▁Massachusetts ▁Turn pi ke ▁Author ity ▁and ▁promised ▁to ▁take ▁legal ▁action ▁to ▁ou st ▁Am or ello ▁after ▁count less ▁defect s ▁in ▁the ▁t unn els ▁were ▁discovered ▁including ▁hundreds ▁of ▁le aks ▁and ▁signs ▁that ▁struct ural ▁bol ts ▁were ▁lo osen ing . ▁ ▁When ▁he ▁was ▁appointed ▁chairman ▁of ▁the ▁Turn pi ke ▁Author ity ▁in ▁ 2 0 0 2 , ▁Am or ello , ▁a ▁long time ▁state ▁sen ator ▁from ▁G raft on , ▁inherited ▁the ▁Big ▁Dig ▁project ▁that ▁was ▁already