Which of these actors was one of the major stars in "Ghostbusters"?

Ghostbusters is a 1984 American comedy film directed and produced by Ivan Reitman and written by Dan Aykroyd and Harold Ramis. It stars Bill Murray, Aykroyd and Ramis as eccentric parapsychologists who start a ghost-catching business in New York City. Sigourney Weaver and Rick Moranis co-star as a client and her neighbor, and Ernie Hudson as the Ghostbusters' first recruit.

William James Murray (born September 21, 1950) is an American actor, comedian, and writer. He first gained exposure on Saturday Night Live, a series of performances that earned him his first Emmy Award, and later starred in comedy films—including "Meatballs" (1979), "Caddyshack" (1980), "Stripes" (1981), "Tootsie" (1982), "Ghostbusters" (1984), "Scrooged" (1988), "Ghostbusters II" (1989), "What About Bob?" (1991), and "Groundhog Day" (1993).