article_snippet: Analysis linking a letter Robert Durst's wrote to Robert Durst's friend Susan Berman a year before Susan Berman death with one Robert Durst's said 'only the killer could have written' to point police to Susan Berman body was the key new evidence in the long-dormant investigation, a police source said.
article_snippet: Durst and documentary producer Andrew Jarecki (right) examine handwriting examples  from two letters.
article_snippet: Analysis linking a letter Durst wrote to Susan Berman a year before Susan Berman death with one he said 'only the killer could have written' to point police to Susan Berman body was new evidence in the investigation, a police source said .
article_snippet: The documentary showed filmmaker Andrew Jarecki confronting Susan Berman with a copy of an anonymous letter that alerted Beverly Hills police to look for a 'cadaver' at Berman's address.
article_snippet: Susan Berman offered that whoever sent it was 'taking a big risk.
article_snippet: You're sending a letter to police that only the killer could have written.'
article_snippet: Then, in the final episode, filmmaker Andrew Jarecki revealed another envelope, which Susan Berman acknowledged mailing to Berman, that has similar writing in block letters and also misspelled the address as 'Beverley.' '
article_snippet: but I did not write a 'cadaver' at Berman's address one,' Susan Berman said.
article_snippet: But when shown an enlargement of both copies, Susan Berman couldn't distinguish both copies.
article_snippet: Even if Susan Berman wasn't the prime suspect, you would think filmmakers would have been looking through all Susan Berman papers to see if the person who killed Susan Berman had ever written Susan Berman a letter,' New York defense lawyer Michael Devorkin said. '