AceShowbiz - The real reason behind Justin Lin's exit from "Fast X" has been revealed. Days after the director announced his departure from the tenth film in the "Fast and Furious" franchise, a source alleged that he quit the project due to Vin Diesel's alleged unprofessional behavior on set.

I've never seen anything like it. Lin's giving up $10 or $20 million," one veteran producer who is not involved in his film told the New York Daily News. "Diesel shows up late to the set. He doesn't know his lines. And he shows up out of shape."

Lin confirmed his exit in a statement released on Tuesday, April 26. He said, "With the support of Universal, I have made the difficult decision to step back as director of FAST X, while remaining with the project as a producer."

"Over 10 years and five films, we have been able to shoot the best actors, the best stunts, and the best damn car chases. On a personal note, as the child of Asian immigrants, I am proud of helping to build the most diverse franchise in movie history," the 50-year-old added. "I will forever be grateful to the amazing cast, crew and studio for their support, and for welcoming me into the FAST family."

Lin first joined the "Fast and Furious" franchise for the third installment, "The Fast and the Furious: Tokyo Drift". After directing the fourth ("Fast and Furious"), fifth ("Fast Five"), sixth ("Fast and Furious 6") installments, he took a break before returning for "F9".

Now that Lin has left the project, it was unveiled that he will be replaced by "Now You See Me" and "Incredible Hulk" director Louis Leterrier. The French filmmaker is reportedly Universal picture's first choice among numerous candidates for the job.