The poor girl was supposed to get marry over the last weekend, but she never made it. She went missing last TUE and finally her bod was found inside the wall in the lab where she worked. Clearly the killer is someone she knew.
http://www.huffingtonpost.com/2009/0..._n_286632.html
My guess is a psycho coworker with a crush. Last attempt to keep her from marrying perhaps?