Speaking of Andy Glazer, I'm pretty convinced that he reported his own suicide on IMDB right before taking his life:
http://www.imdb.com/name/nm1334045/bio
Glazer maintained his own IMDB page (even though his biography was written in third-person format), and most people did not know he even had an IMDB page, as he was known as a writer, not an actor.
The date of death and the suicide cause-of-death appeared on July 4, 2004 (the same day he died), and it's unlikely that anyone close to him would have taken the time to update the IMDB page in such a fashion on his date of death. They would have had a lot more on their mind than that. His death was not reported to the public at that time.
I believe he listed his own death there because he wanted to give the IMDB page some closure, since the page was apparently important to him.