Daisygirl, I have always kept this case close to my heart for many reasons. The most profound is that women are missing from everyday life from their own homes without much motive or reason, not that murdering anyone is ever going to be rationalized. And, the one reason that tugs at my heart is the brutal nature of your daughter's loss as reflected in the evidence that has been gathered. Whoever has done this is a very serious threat to society.
I've often wondered what would come of an indepth behavioral science analysis from a behavioral specialist, a forensic psychologist, etc... to build a profile of the type of killer that would do this, and why. Less, speculation, and more based in concrete scientific analogy a rounded indepth profile.
The results of which, made public in combination with pleas as you have recently posted, just may jog a few memories, or bring someone in the limelight. I can only hope the perp has been in trouble before and that tips the hand in your favor.
I believe there are similarities to your daughter's case to several all over Canada, as well as very near to Wellington...but then again it is not unusual it seems to have them missing without a trace, or with evidence found later which leave little clues. Perhaps some analysis will start putting these pieces together.
My thoughts have always been and will continue to be with you, your family and Alex's friends.