Sorry guys, I don't mean to post hearsay or rumor, but this actually seems legit. Of course, the source could be totally wrong, so apologies in advance if it is. But I saw it on a website called the Drudge Report, which is usually pretty legit. It's currently on the main or front page of the website: there's a big picture/painting of Christopher Reeve as Superman and a caption that reads "Report: Christopher Reeve is dead." The remainder reads:
"Nikki Finke in Los Angeles is reporting that actor Christopher Reeve is dead, according to sources close to the actor. He died suddenly Sunday. News of his death has not been reported publicly yet. His family will make an announcement Monday at the earliest. Reeve was just mentioned Friday in the second live presidential debate by John Kerry. Noting he was a friend of the paralysed Reeve, Kerry said he was in favor of further stem cell research because Reeve could walk again one day thanks to such science.... MORE..."