One witness said, "She's extremely difficult. When she gets to the set, it comes to a grinding halt. She's so hot and cold, you never know."
It was also reported that her husband Monjack would lurk around the set and intervene so much that producers had to call a meeting to discuss how to deal with him.
Just last month Murphy was reportedly fired from a movie she was working on in Puerto Rico. Perez Hilton reported that the actress "apparently ... has a habit of being difficult on the set," and claimed that Monjack allegedly got involved in a fight "with some locals."
Murphy's spokesperson denied reports the actress was fired from "The Caller," saying instead that she left the movie over "creative differences."
"The allegations currently circulating on the Internet about Brittany Murphy and her husband Simon Monjack read like a fictional plot from one of the 50 plus movies Ms. Murphy has successfully completed without incident," her representative told World Entertainment News Network. "She was not nor has she ever been fired from any job big or small. Mr. Monjack did not engage in any alleged scuffles. Though due to creative differences Ms. Murphy and the production mutually parted ways."
Murphy's husband Monjack was rushed to a Los Angeles hospital on Nov. 29 after his plane landed. Murphy reportedly didn't think it was serious enough for Monjack to go to the hospital, but the fire department disagreed. According to TMZ, Monjack was incoherent when EMTs boarded the plane.
Despite what happened behind the scenes of her films, her colleagues respected her talent.
Director Edward Burns once told the Los Angeles Times, "She's one of those talents that is a real chameleon. She was able to be vulnerable without playing the victim -- I don't know how you do that, but she does..."
In what was probably her final public event on December 3, Brittany Murphy walked the red carpet, looking thin but gushing about her family and looking forward to the new year.
According to "Access Hollywood," the actress, attending a boutique opening in Los Angeles said she was looking forward to 2010. "As far as having a New Year's resolution, I'd love to have a child next year," she said. "But that's kind of a large one!"