investigators learned that copple blamed adriane insogna for the breakup of his engagement to lily prudonet 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. he admitted to police that he was drunk. the fight with his ex-fiancee only added to the anger and bitterness he felt towards adriane insogna, so he took revenge. prosecutors believe copple stood outside the house where adriane lived with her two roommates, casing the place and smoking cigarettes. he used a knife to pry open the window and accidently dropped the packet of zip ties on the floor with his dna. leslie's bedroom was the first room at the