I don’t know, either,but here is link that says he is:
http://www.people-in-the-news.com/2011/11/13/larry-sinclair-is-dead/
I don't actually know if dead is Larry Sinclair or not.
Usually a writeup about a hit and run will have a little less material about one particular book. If that article is an obit, then it would have a little more on Larry Sinclair himself.
What kind of blog, or web page, is that? People in the news!? Is that legitimate?
People In The News might as well be Weekly World News. We’re talking about two “news” sites that traffic in the sensational.