Watford have sacked Nigel Pearson, with former Republic of Ireland Under-21 goalkeeper Graham Stack coming in alongside Hayden Mullins for the final two games of the season.
The 56-year-old was informed he would be leaving Vicarage Road by the Hornets' technical director Filippo Giraldi on Sunday.
Watford are 17th in the Premier League, three points above the relegation zone, ahead of Tuesday's visit of Manchester City. Assistant Craig Shakespeare has also departed.
Pearson took over from Quique Sanchez Flores, who lasted just three months, and became Watford's third manager of the season after the September dismissal of Javi Gracia.
He was appointed in December, when the Hornets were bottom of the table, and won seven of his 23 games.
Watford confirmed Pearson's departure on Sunday night with a short statement.
"Watford FC confirms that Nigel Pearson has left the club with immediate effect," read a club statement.
"Hayden Mullins, with Graham Stack as his assistant, will take up the position of interim head coach for the Hornets' final two Premier League fixtures of the 2019/20 season.
"There will be no further comment."