Sunil Tripathi committed suicide, and while missing was named as one of the Boston bombers by a bunch of Reddit detectives leading to harrassment of his family, but I don't think the suicide was a result of being misidentified.
I think that's where the GP's mistake originated, though, since there was a public misidentification of someone who committed suicide.
Reddit was never on the level of Twitter in terms of real-time news relevancy. Tweets are broadcast on television and used as sources for news stories constantly.