Stephen King writing a novel about JFK

Horror writer Stephen King is currently working on a new novel, and he’s going about it from a slightly different angle than usual.  The book is going to be called 11/22/63, and apparently it’s about a guy who finds a portal that leads to 1958, and he travels back in time in order to try to prevent the Kennedy assassination.

I’m too lazy to Google it, but I’m 99% sure there’s a Twilight Zone episode that’s based on exactly the same storyline – guy travels back in time, prevents Kennedy from dying, and then has to live with the consequences of his actions.  It still sounds like an interesting idea, but you would think King wouldn’t bother with a story that had already been written.  Maybe he’ll put a unique spin on it – that seems to be his thing.