and the murder of his neighbor in texas raising the question many have asked, could he have murdered them all. they found him not guilty in the murder of his neighbor. he admitted to killing him but argued it was self-defense. >> based on the evidence that was presented to us there was reasonable doubt. >> reporter: now he faces another murder trial after his lawyers warned him not to take part in the documentary. >> they said about a stillon times you can't help yourself. right now you're a free man. you say something inadvertently and you'll find ourself charged in new york or charged in los angeles. >> reporter: the series uncovered new evidence including a letter addressed to susan bermen from durst. the handwriting and misspelling look similar to a letter police