He credits Melissa McCarthy with changing his mind. Read the full article on AICN After years of publicly refusing to feature in a GHOSTBUSTERS 3 and stringing Aykroyd and Ramis along until the latter died, Bill Murray agreed to cameo in this Feig-directed reboot, albeit not as Peter Venkman. Which brings about the question: por que? While talking with Vulture, the Murricane had this to say when asked about his participation: “You know, they were incredibly nice to ask me, and I really enjoyed being there.