Yesterday, we reported the tragic news that beloved actor/writer/director Harold Ramis passed away at the age of 69, due to complications from a rare blood disease known as autoimmune inflammatory vasculitis. While the Hollywood community and fans alike are still mourning this great loss, Sony Pictures and director Ivan Reitman are trying to figure out how to proceed on Ghostbusters 3, which was set to feature a cameo appearance from the actor before his passing.

We reported in November that Sony was planning on starting production this spring in Cleveland, but, even before Harold Ramis' death, the script had not progressed enough to begin shooting in 2014. The script, written by Gene Stupnitsky and Lee Eisenberg, will now need to be reworked even more, since Harold Ramis was set to appear as Dr. Egon Spengler in a brief cameo appearance, along with Dan Aykroyd and, reportedly, Bill Murray.

Dan Aykroyd has said numerous times that Bill Murray will not be back as Peter Venkman, but perhaps that may change now. The story will usher in a new trio of ghostbusters, under the guidance of the original characters. This new report also reveals that the original stars may even be willing to take lower salaries in order to get the sequel off the ground, although no deals have been finalized yet.

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Dan Aykroyd revealed in May that the script is based on new particle physics research that is being conducted at Columbia University, in an interview with Larry King.

"It's based on new research that's being done in particle physics by the young men and women at Columbia University... Basically, there's research being done that I can say that the world or the dimension that we live in, our four planes of existence, length, height, width and time, become threatened by some of the research that's being done. Ghostbusters -- new Ghostbusters -- have to come and solve the problem."

We reported in November that Jonah Hill and Emma Stone were offered unspecified roles in the sequel, possibly as two of the new Ghostbusters, although Emma Stone passed on the role a month later. It still isn't known if Jonah Hill will sign on or not.