Pikachu, the online version of Giles - quite punny in making avatars. ;)
I still haven't really worked on whom I think is the killer; however, that is because I'm having more fun trying to solve the crime and figure out who will be the next one to be eliminated.
The only one I am still currently taking out of the running as the killer is Dana because based on the teaser for the season I maintain she is an eliminated contestant.
Of course there IS one thing I forgot to mention that could toss this in the water -Click to see Spoiler:I'm basing this on her being the one cholorformed/attacked by the killer in the teaser, and given how they've done the rest of the deaths there IS a slight chance this is a distraction/set up to where she plays the victim but in reality they find she is not dead - and is the killer.