Robert Durst's lawyer says meth use interview was illegally obtained
Prosecutors spoke with Durst without his counsel present, Dick DeGuerin says
Robert Durst pleads guilty to federal gun possession charges
The New York real estate heir faces 85 months in prison
Andrew Jarecki reflects on the year he got Robert Durst to admit that he 'killed them all'
Looking back on 'The Jinx,' the filmmaker says, 'In many ways Bob was my friend'