i wasn't there for her when she needed me. when i found that she wasn't alive, it's like, "why her? why not me? should've been me." narrator: sierra's lifestyle might or might not explain what looked like a sex crime. mancuso: she was using prostitution to help support her drug problem. i don't want to use the word "gypsy," but she really just kind of lays her head wherever she can find a spot. mcgee: sierra lived a high-risk lifestyle. her background may have affected me a little different than it does others, because i grew up in a community where people ended up like sierra. and so i saw myself in sierra, and it became more personal to me. narrator: and now investigators got another possible break. sierra had been released from jail on a minor drug charge just three days before her murder. mcgee: so her background helped in a way and hurt in a way. it helped because we only needed