The 42-year-old, who replaced David Moyes as manager in 2013, had faced mounting calls for his departure after a run of just one win in their last 10 games.
And Everton announced on their official Twitter feed:
Everton Football Club regrets to announce that Roberto Martinez has left his position as First Team Manager with immediate effect.
— Everton (@Everton) May 12, 2016
Tthe Club’s End of Season Awards, due to be held at St George’s Hall tonight, has been postponed. pic.twitter.com/W7OiRl0V6Q
— Everton (@Everton) May 12, 2016