The prevailing theory is that Dani was doing what she always did, putting someone else first by helping a casual acquaintance who claimed to need a ride home, and he thanked her by raping her and then murdering her to prevent her from reporting the rape. People are looking for other motives because it's horrifying to think of the life of such an amazing, loving, positive person being wasted because of such callous selfishness. Unfortunately, those of us who have followed missing person cases over the years have seen that scenario repeated over and over and over again. Guys like this security guard think of women as tools for their own sexual gratification, to be disposed of at will. There is some debate about whether the crime was preplanned, and an OD from a date rape drug is possible, but any scenario that doesn't involve rape is far fetched.