I have a feeling this whodunnit murder is going to be slow, tedious, and turn out to be someone random that will build up as it gets nearer to the reveal, but in retrospect, the clues were not there in the beginning. By that, I bet ReRon wrote the murder scene, put in obvious suspects, but has no idea at the time who he was going to have be the murderer. I highly doubt it will be Lucas, Leo, or Gwen unless they want to get rid of one of the actors or they wanted to leave.
Just like Deimos' murder, it's going to be up in the air for awhile, then have a lame reveal. And I still do not believe that Nicole murdered him.