Ok. I am putting this in the rumor section because don't know how valid this is. But on the "official" LI Serial Killer site, some woman has been claiming she has info regarding the case. She has posted video she found on youtube claiming this might have been made by the killer. The videos are kinda disturbing.
Here is the link to the article. The comments where she posted is right after.
http://longislandserialkiller.com/2011/05/two-more-murders-may-be-linked-to-long-island-killings/
The first video is here...at one point he turns the camera and there appears to be someone with a bag over there head, sitting in a chair.
http://youtu.be/cJsVgFPQt8o
The next one where she made the connection, when he turns the camera towards the tv, one of the victims is on it. And it does kinda look like her.
http://youtu.be/SXo0PbzpabA
Her post has time frames to find stuff quicker. I don't know if this has anything to do with the case, that's why I posted it in the rumor section.