"Fast & Furious 7" filmmakers are currently in the process of rewriting the series' latest film following the sudden death of one of its stars, actor Paul Walker, last November. While planning is well under way to continue shooting the unfinished flick, and a new release date has since been announced, one cast member is now saying the film's rewrites have been nothing short of a disaster.

During his appearance at the Sundance Film Festival Tuesday, the veteran actor Kurt Russell, a newcomer to the "Fast & Furious" franchise, divulged details about the coming film. "They're having to rewrite, they're having to do whatever they're having to do to deal with the situation," Russell told Us Weekly, going on to call the situation "catastrophic" and the "worst thing that could happen to a movie."

Russell, 62, who originally signed on to play a "father figure" to Walker's character Brian O'Conner, said he is now unsure what will come of his role and Walker's in the action drama. "I don't know what is going to happen with that. It's obviously a difficult situation," he said. "Whether or not this guy dies off in the movie, we don't know. That may have changed now significantly too."

In December, Walker's longtime "Fast & Furious" co-star, Vin Diesel, announced that the premiere date of the franchises' latest film has been pushed back to April 15, 2015, following Walker's death. The film was originally scheduled for a July 11, 2014, theater release.

Walker passed away at the age of 40 on Nov. 30, alongside his friend, Roger Rodas, in a fiery car crash in Santa Clarita, Calif. According to autopsy reports, Walker perished from a combination of traumatic and thermal injuries. He is survived by his 15-year-old daughter, Meadow Walker.