suspect's dna. >> copple was arrested and charged with two counts of first-degree murder. investigators learned that copple blamed adriane insogna for the breakup of his engagement to lily prudone. >> it appeared that some people and possibly adriane, were telling lily that she could do better and that she shouldn't any longer be involved in this relationship with eric copple, that he wasn't good for her or right for her. >> on the night of the murders, copple went to a halloween party and ran into his ex-fiance, lily prudone. according to witnesses, the two argued. copple wanted to set a new date for their wedding, but lily wasn't interested. >> can you just leave me alone for the rest of the night? please. ♪ >> after the party, copple returned home.