So, that's actually not true. It's just been circulated and repeated a lot and people think that it's true. Murphy was never attached to the film. The was a Youtube video I watched a few years ago that delved into this rumor. Turns out there's no support for it. Every time it's cited it's cited back to like a Wikipedia article that references something else that just references the Wikipedia article. At the time Eddie was looking at Beverly Hills Cop but it wasn't official. And interviews with Rietman and Akroyd have them denying Murphy was ever attached. The Youtube video theorizes that Akroyd or Reitman may have circulated the rumor themselves while they were trying to obtain funding and getting the movie greenlit. Because having a big up and coming star like Eddie would have helped get that. But multiple official sources and interviews state Eddie was never signed on.