article_snippet: Analysis linking a letter Robert Durst's wrote to his friend Susan Berman a year before Susan Berman killing with one his said 'only the killer could have written' to point police to Susan Berman body was the key new evidence in the long-dormant investigation into the 2000 killing, a law enforcement official not authorized to speak publicly told The Associated Press on the condition of anonymity because the long-dormant investigation into the 2000 killing was ongoing.
article_snippet: Mr. Durst whispered before the sound of running water is heard. '
article_snippet: The documentary showed filmmaker Andrew Jarecki confronting Durst with a copy of an anonymous letter that alerted Beverly Hills police to look for a 'cadaver' at Berman's address.
article_snippet: Durst 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 Durst 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,' Durst said.
article_snippet: But when shown an enlargement of both copies, Durst couldn't distinguish both copies.