It was announced at 8:30 AM on Sept. 15, and we were first to report on it, that Edwin Newman, long  a mainstay of NBC's news and documentary programming, has died.  NBC has yet to announce where and when he died and what the cause of death was.  Natural causes should be a suspect since Mr. Newman was 91.  He was in the Navy during World War II, then began a career in jounalism.  After a stint with CBS in New York, Newman switched to NBC in 1952 in London and remained with the Peacock Network until he retired in 1984.  Over the years, he anchored the NBC Nightly News and Meet the Press, and the Today Show.