The axe has fallen on Marco Silva after Everton's chastening 5-2 defeat to Liverpool in the Merseyside derby. From recruitment to set-piece woes, we take a look at what went so wrong and why.
It was a fresh-faced Marco Silva who worked through the doors of USM Finch Farm for the first time on the final day of May in 2018.
The then 40-year-old was tasked with lifting the gloom that had set in under Sam Allardyce, his predecessor, who had brought improved results but in a style that had left many supporters disgruntled and others totally disaffected.
"I know what our fans expect - they expect results but not only results," he said at his unveiling. "I want our fans to be proud when they see our team on the pitch."
The Portuguese was brought in with the hope of his side playing more attractive football and was backed with almost £90m of new signings in his first summer.
But after an encouraging first season under the Portuguese and a third summer of hefty outlay, Everton are now seeking a fifth permanent manager since David Moyes left for Manchester United in 2013.
The 5-2 defeat to Liverpool at Anfield left Everton in the relegation zone. How did it go so wrong?
Poor summer recruitment
There was a sense of optimism at Everton during the summer after a strong end to the season saw the team finish eighth - three points off a Europa League qualifying place.
The hope was that, with a kind opening set of fixtures and a good summer of recruitment, Everton could kick on.
Silva sought to make Kurt Zouma's loan signing permanent, but he and director of football Marcel Brands failed to land their first-choice centre-back option.
On the final day of the summer window, Silva targeted Manchester United's Marcos Rojo, but Brands reportedly vetoed the deal - leaving Everton with only three options in that key area.
The other key area that needed strengthening the attack. The bar was set high, targeting Juventus marksman Mario Mandzukic and the Crystal Palace winger Wilfried Zaha. But they ended up signing Alex Iwobi, a bit-part player at Arsenal, for £30m and the 19-year-old Moise Kean, seen as a coup, but still a young prospect, who is yet to score since his £27m arrival from Juventus.
An injury-ravaged midfield
Ask any Everton fan who would make the club's Team of the Decade, and Idrissa Gueye would be the first name on the teamsheet, but the club could not stand in the player's way in the summer after initially rejecting a transfer request last January.
The Senegalese midfielder joined PSG for £30m - a modest sum for such an important player - but Silva has been unable to call upon his replacement for the vast majority of the season.
Fabian Delph arrived to bring some much-needed experience, but it was the £25m signing from Mainz, Jean-Philippe Gbamin, who was tasked with replacing Gueye's energy and ability to protect the defence.
Everton kept two clean sheets in their opening two Premier League matches, with Gbamin featuring in both, but since he has been sidelined with a serious quad injury, the side have kept just one clean sheet in 13 Premier League matches.
Silva's midfield options were further depleted when Andre Gomes suffered a fracture dislocation of his right ankle in the 1-1 draw with Tottenham, while the creativity of Bernard has been missing since a knee injury in that defeat to Brighton.
Pressure has subsequently mounted on the shoulders of youngster Tom Davies and Morgan Schneiderlin, but had Silva's first-choice options been available, it is arguable whether either would even make the bench.
The knock-on effect has seen the captain Gylfi Sigurdsson being asked to play a deeper role at times, unable to focus on his strengths in a free role behind the striker.
Results weren't good enough
For all the mitigating factors, Everton have lost five of their past six Premier League games against newly-promoted teams, as many as in their previous 48 combined. Their run to the Carabao Cup quarter-finals has proved not enough to keep Silva in his job.
Everton's third home loss of the campaign against Norwich saw them slip to 15th place.
With the daunting set of fixtures in December, this was the most damaging defeat of Silva's reign, and ultimately there was no way back.
The Portuguese's objective, clearly set out by the board before the campaign, was to finish in a European position via the league. Three defeats against newly-promoted teams in this wretched run is unbecoming of a club with such lofty ambitions.
Failure to cure set-piece woes
A key area that undermined Silva's attempts of progress was his side's woeful failure at defending set-pieces.
There were reports that it was the manager's obsession with curing the problem that at times proved counter-intuitive as he stubbornly stuck with a zonal-marking system.
But since the start of last season, Everton have conceded 24 goals from set-pieces, more than any other Premier League side in that time - bringing his alarming record at Hull City (11) and Watford (12) to Goodison.
This improved marginally over the past two months as Silva tweaked his system to part zonal, part man-to-man, but it was the sight of those same old failings which played a big role in convincing some supporters that his long-term vision was flawed. Lessons were not being learned.
Bad luck?
It was not just the unfortunate injury to Gomes that Silva will point to as misfortune contributing to his demise.
Everton have not been on the right side of technology this season, with Brighton benefiting from the first time a referee has been over-ruled on the pitch by VAR during their 3-2 win in October.
During that 1-1 draw with Tottenham, there was another debatable decision that went against Everton as referee Martin Atkinson failed to use a pitchside monitor to spot an apparent handball from Dele Alli.
Silva's bad luck was compounded in the 2-1 defeat to Leicester as Kelchi Iheanacho's stoppage-time strike being allowed to stand after a VAR review - despite the linesman's flag being raised for offside in the build-up to the goal.
Everton could conceivably have had four more points were it not for marginal, contentious calls - which would have propelled the team into mid-table, three points off sixth place.
Always losing when behind
Everton were behind in 28 Premier League games under Silva - but he was only able to salvage five points during those games, failing to win on any occasion.
It led to an inevitable eighth loss in the last 11 games. With Arsenal and Manchester United both suffering bouts of turmoil this season, the opportunity was there for Everton. to realise their hopes of breaking into the top six. But they have hurtled backwards, and drastic action was needed by Moshiri to preserve the club's Premier League status.
Too often under the Portuguese, a lack of resolve was on show when events conspired against his team during a match, with Silva often seeming to panic with his substitutions as he chased a comeback.
But another unwanted trait began to seep in towards the end as that apparent weak mentality saw victories slip through their grasp as Brighton's controversial win at the Amex Stadium was followed up by Leicester's late show.
When Georginio Wijnaldum struck Liverpool's fifth at Anfield, it was the fifth time this season that Everton had conceded a 90th-minute goal this season.
Lack of leadership exposed tactical ineptitude
A lack of leadership has undermined his tenure, exacerbated by the departure of Phil Jagielka in the summer.
Club captain Seamus Coleman has struggled with form and fitness, leaving Sigurdsson with the armband. It has been an ill-fitting arrangement.
Mason Holgate said following the defeat at Anfield: "Coming into the match, that [Liverpool's ball over the top] was something we highlighted but it's not something we've dealt with. The manager has told us what we need to be doing but we have not gone out and done that."
For all of Silva's insistence on having a clear vision on how to succeed, he was often unable to translate his message to his players, chasing games with a shapeless side. Like-for-like substitutions also bemused supporters. Everton were two down inside 17 minutes, forcing a tactical change - but the damage had been done.
Abject failure at a time of Red supremacy
It is 37 years since Everton last conceded five goals against Liverpool, and with some fans heading for the exits during the first half on Wednesday, with it went any hope of salvation for Silva from two arduous away games since the defining, deafening home defeat to Norwich.
Majority shareholder Farhad Moshiri has invested the best part of half a billion alone on player recruitment since arriving four years ago, and with Everton back at Goodison this Saturday against Chelsea, he felt he was in no position but to remove Silva from his post in order to avoid another potentially toxic atmosphere.
It was when Ronald Koeman took Everton last into the relegation zone back in October 2017 when he last acted, and he has pulled the plug once again.
"I am not the right person to talk to you about the situation," Silva said. "I cannot answer you. Since I joined the club, and until the last day I am here, I will always be 100 per cent professional, giving my best every single day.
"I understand why the questions are coming. If we are winning all the games, you are not asking them. But I don't like to talk after every single match about my future."
But now, Silva has his answer.