Derek Llambias has resigned from his post as managing director at Newcastle, the club have announced.
Llambias' resignation comes a day after Joe Kinnear was confirmed as the club's director of football on a three-year deal.
In a short statement on the club's official website, posted 20 minutes before the release of the 2013-14 season fixtures, Llambias said: "I have had an incredible journey during my five years at the club, including some challenging times. I will reflect with great fondness on my time in the north east and, in me, Newcastle United have a lifelong supporter."
He added: "I want to thank the staff for their hard work, our fans for their support of the club, and wish them all well for the future."
Llambias, who has worked closely with United owner Mike Ashley since he took over the club in 2007, has polarised opinions of the club's fans during his time at St James' Park.
He has overseen the sales of some of the club's most popular players, such as Andy Carroll and Kevin Nolan, while also being involved in controversial decisions such as the one to appoint Kinnear as manager in 2008 and changing the name of the club's famous ground.
There have been positives too - the club's smart recruitment and wage policy was heralded when they finished fifth in the 2012-13 season, but a troubled last campaign stirred things up once more.
Kinnear's return to the club, which he announced on Sunday but the club did not confirm until Tuesday, caused outrage among Newcastle fans, with the 66-year-old giving a radio interview during which he insulted them.
He also pronounced a number of first-team player's names wrong, while also referring to Llambias as Llambeeze. The ex-Wimbledon manager correctly called Llambias' resignation, before claiming to have replaced him, even though Llambias' job was a different one.
He told talkSPORT on Monday: "I only signed the contract last night. So that was someone speaking to Mike but it's been ongoing for the last three weeks. Derek Llambeeze was the director of football. Derek has resigned now."
Source: PA
