Fittler, who was unclear over whether he wanted to continue in the role at the end of this year's series, had appeared to have made up his mind, pitching to the board of the NSWRL in recent times over why he should continue in the role.
It was believed he had floated names like Phil Gould and Ivan Cleary to join him in an all new-look coaching set-up, with former chief advisor Greg Alexander opting out, and reports suggesting the likes of Paul McGregor, Danny Buderus and Andrew Johns from his support staff were going to do the same.
It's believed the NSWRL were aiming to make a call this week on the future of Fittler, but now the administrative body have confirmed Fittler won't be continuing in his role.
“The Board understands and respects his decision,” NSWRL chairman Paul Conlon said.
“Freddy was a legend as a player and returned to coach the team at a time when his state needed him.
“He also contributed through other programs including his Hogs motorcycle rides in regional NSW which played a big part in uniting the state.
“He holds a special place in NSW Rugby League history.”
It's understood Fittler made his decision on Thursday, despite all reports suggesting he was going to be given another year in charge after his pitch.
The statement confirmed the NSWRL will accept expressions of interest for the role.