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>> reporter: especially after friends told detective mois that jessyka thought something illegal was going on at her party, asking them -- >> "are they doing a drug deal in the house? this is not okay." >> i just know that people came outside and said, "hey, that guy there, he's got pills if anybody needs any." >> so i want to know exactly who invited this guy to jessyka's house that night. who thought that would have been okay to do that? >> reporter: the answer complicated matters even more. friends told detectives that the man who'd invited the drug dealer also tried, at the party, to initi...

Went on in the evening more and more people weren't showing up to jessica's residents, whom she didn't know. >> what does that do to an end get investigation? >> it opened our suspect for quite a bit. >> especially after friends told detectives that jessica thought something illegal was going on in her party. asking them -- >> are they doing a drug deal in my house? this is not okay. >> i just know that he came outside and said hey, that guy in there he's got pills if anyone needs any. >> so i want to know exactly who invited this guy to jessica's house that night. who thought that would've be...

Also tried at the party to initiate some kind of sexual encounter with jessica. >> he was in the bathroom and she went to go grab a towel and she let her in the bathroom and then he was like do you want to stay in here with me. she is like no, i just want a towel. i guess he had like tried to close the door and all of this stuff and she said no and opened the door and walked away. now they had to track him down. >> how often did you spend on this? >> several weeks. that's all we were doing was attempting to identify these people, locate them and interview them and it was a vetting process as f...