The filmmaker's daughter died by suicide in March, prompting him to take a break from work and Joss Whedon to finish the Warner Bros. superhero pic: "I’ve decided to take a step back from the movie to be with my family, be with my kids, who really need me."
Superheroes have always been about doing the right thing in the hardest of circumstances. Now Zack Snyder, one of the biggest filmmakers in the genre and the director of Batman v Superman: Dawn of Justice and the upcoming Justice League, finds himself in just such a situation.

Snyder tells The Hollywood Reporter he is stepping away from Justice League, Warner Bros.’ all-star DC Comics superhero mega-movie that is in post-production, in order to deal with the sudden death of his daughter. Snyder's wife, Deborah Snyder, who is a producer on Justice League, also is taking a break to focus on the healing of their family.

Stepping in to shepherd the movie through post and the shooting of some additional scenes will be Joss Whedon, the Avengers filmmaker and creator of Buffy the Vampire Slayer. With Whedon's help, the movie is still on track for its Nov. 17 release date.

http://www.hollywoodreporter.com/heat-vision/zack-snyder-steps-down-justice-league-deal-family-tragedy-1006455