Shanahan has severed all ties with Wests Renault Park
Cambridge director of rugby James Shanahan has quit the club.
The move follows the recent departure of president Jerry Otter and sees coach Bob Crooks take sole charge of the playing side of the club.
The 33-year-old former player-coach told BBC Radio Cambridgeshire: "My decision to leave the club has not been easy or taken lightly.
"I'd like to make it clear that my decision to resign is not linked to recent performances."
Shanahan had been at the club for almost five years and at the beginning of the season combined his player-coach role with that of director of rugby.
Under his guidance the side climbed from National Three South to second place in National Two, narrowly missing out on promotion to the newly formed Championship.
Cambridge have failed to win in their last four matches but Shanahan insists his departure has more to do with off-field issues.
He said: "There are some other factors but I don't want to make those public.
"I'll keep those to myself and I'll walk away with my dignity. I think I've got a career in coaching and I'd like to help another club if it's ambitious like Cambridge."
A club statement said: "It is with some regret that the executive of CRUFC have accepted the resignation of James Shanahan as director of rugby at the club.
"Under Shanners' stewardship Cambridge have had a steady rise through the leagues to our current position in National League One.
"The executive would also like to put on record their gratitude for his service to the club and recognised both the achievements and the contribution made to the club's success in recent years."
Meanwhile, the club have formed a partnership with Comberton Village College to form a youth academy.