>> it was discussions that carter cervantez had had with people where she expressed certain -- i guess you would call them fantasies involving killing people. >> reporter: liza schoenthal remembers one such discussion at work. >> it was just us. and we were folding clothes, and she mentioned that she had thought about killing someone before and whether or not she could watch them die. >> reporter: as if the murder wasn't shocking enough, prosecutors were pretty sure ashlea's murder was a thrill kill planned by a sadistic young woman who thought she was smarter than everyone else. but tiny, meek, carter cervantez admitted none of that. she still had a plan, concocted all by herself, to explain why she, too, was a victim. >> announcer: coming up -- a vicious killer? >> reporter: you wanted to see the death penalty? >> death penalty was what i wanted.

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