Los Angeles, Sep 22 (DPA) Johnny Depp may walk away from a fourth installment of 'Pirates of the Caribbean' after Disney ousted the veteran studio chief who first backed his vision for the role of Captain Jack Sparrow, Los Angeles Times reported.

Studio chief Dick Cook left the company Friday following a string of disappointing box office results and the studio's failure to consistently create popular films for the crucial teenage audience. Disney recently paid $4 billion to buy Marvel Entertainment and gain control of its stable of superheroes such as Spider-Man, Iron Man and the X-Men.

Depp said he was 'shocked and very sad' about the ouster of Cook, who started at Disney 38 years ago as a tour bus operator.