how is it possible for a 6ft person to hang from a 5ft anchor point?
I know very little to nothing about this case, so I will not comment on anything to do with it. I just wanted to answer your question I quoted.
Robin Williams hung himself with a belt wedged between the door and the door jam while seated. Very easy to conceive how someone who wants to die can hang themselves from any elevated position.
http://www.foxnews.com/entertainment/2014/08/12/robin-williams-hanged-himself-with-belt-wrist-cut/