I've just been reading one of the reviews on the Episode One page guide and it says:
"The plastic sheeting on which Shelly collapses is a nice touch and serves as yet another pointer to Leo as being the killer."
I've only watched the pilot and episode one.. and I'm hoping that I haven't just came across possibly the biggest spoiler in the show.
Please tell me I haven't.. heh. Although if I have.. I'm not sure I want to know.