Interestingly the lead person of interest in this case David Bookstaber was arrested and charged with felony assault and strangulation. He chains up his girlfriend and tried to suffocate her. Here is the link to the news story Person Of Interest In Berwyn Murder Charged With Felony Assault | Tredyffrin, PA Patch
He also has a blog detailing his side of the story.
Also should be charged with witness tampering. He sent “scripts” to the girlfriend so that the charges could be withdrawn. New charges against Main Line murder figure – The Mercury