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Everton have parted company with manager Roberto Martinez.
The Spaniard's sacking comes on the back of a dismal Premier League campaign, which included just five wins at Goodison Park.
"Everton Football Club regrets to announce that Roberto Martinez has left his position as First Team Manager with immediate effect," the club tweeted.
Martinez joined Everton from Wigan in 2013, succeeding David Moyes at Goodison Park and in his first season he guided the club to an impressive fifth-place finish with their highest-ever Premier League points tally.
Combining the Europa League with their domestic commitments proved difficult last season and they eventually finished 11th.
This season, the Toffees reached the semi-finals of the Capital One Cup and the FA Cup but have struggled in the leagued - they have won just ten of their 37 matches - and they are facing their lowest-placed finish in 12 years.
Fans have vented their frustration in recent weeks and were planning to protest against Martinez at Thursday's end of season awards night and during Sunday's game against Norwich, but the club have acted in the wake of the defeat to Sunderland.
"Everton Football Club regrets to announce that Roberto Martinez has left his position as First Team Manager with immediate effect," a statement from the club read.
"The Chairman and the Board of Directors would like to place on record their thanks for the dedication and commitment Roberto has shown during his three seasons with the Club.
"Roberto has been a great ambassador for the Club, conducting himself, at all times, with the utmost integrity and dignity.
"He secured the Club its highest ever Premier League points total, a place in the last 16 of the Europa League and appearances in both domestic cup semi-finals.
"He has also played a key role in the development of several young players, managing their progression to the Everton First Team and International honours."
Everton host Norwich in their final Premier League game of the season on Sunday and the club has confirmed that David Unsworth and Joe Royle will take charge of team affairs.