There seems to be a misunderstanding regarding two Michael characters on the show and I hope we can clear it up so there are no more unneccessary edits. According to your edits, the scientist from Avocet is the Michael that Rachel is talking about in It's Not a Rumor but it isn't. In several episodes you can see a photo of Rachel in her workspace containing her and her boyfriend who is mentioned in many different episodes.
Rachel's boyfriend is first mentioned by Quincy in passing in We'll Get There while they are arguing. Rachel goes more into detail about him in El Toro in that he is a journalist who was working on the Red Flu story while working in Beijing, China and that she hasn't heard from him in months. When Rachel asks Hunter about "Michael" he mentions he last heard from him months ago in China, correlating with Rachel's boyfriend.
That is my evidence on why Rachel is talking about the reporter boyfriend and not the Avocet scientist named Michael Neustadter. You can watch the episodes again yourself if you can't take my word for it or present counterevidence against this proving me wrong. Either way, please lets try not wasting anymore time on this than we need to, I love how much you are contributing to this wiki.
While it's always nice to have contributors on a wiki as active as you are, I would request that for further contributions you make to the wiki please make sure you follow proper, consistent formatting and make sure your information is correct.
Can you please tell me where you got the information that he is dead? I've looked and there is no mention of him dying. If you mean the lab attacks, there isn't anything to suggest he died in the explosions.