Leeds have confirmed head coach Neil Back has resigned with immediate effect.
The former England and British and Irish Lions flanker decided to step down after Leeds finished bottom of the Aviva Premiership.
Chief executive Gary Hetherington said: "Having met with Neil, he has informed me of his intention to move on at the end of the season to enable him to look for a new challenge. I would like to thank Neil for all his efforts during the past three years when he has helped move the club forward into a stronger position."
He added: "In his first season, we won promotion and last season we defied the odds to retain our place in the Premiership. However, this year we have fallen short by the smallest of margins on the final day of the season and that comes as a disappointment to all of us."
Back said: "The experiences over the last three years have been incredible in terms of my personal and coaching development.
"I am very passionate about what I do and I have thrived on the challenge over the past three years, however taking all things into account, I feel I have taken Leeds as far as I can.
"I am very proud of what Leeds Carnegie has achieved over the last three years against the odds and I wish Leeds all the success for the future."
Back joined Leeds in 2008 and, in his first season, helped the club to promotion.
The Headingley-based outfit finished 10th in 2010 but a final-day defeat at Northampton last week meant they propped up the rest on points difference this year.
Relegation has not yet been confirmed, however, with their fate depending on the outcome of the two-legged Championship final between Worcester and Cornish Pirates on May 11 and 18. Worcester are the only Championship club that meets Premiership entry criteria so if the Pirates triumph then Leeds will get a reprieve.