Marco Kurz has been sacked as manager of Kaiserslautern after a run of 16 games without a win.
Chairman Stefan Kuntz said he would not make any rash decisions in the wake of a 4-1 defeat at home to Schalke on Sunday which left the club six points from safety at the bottom of the Bundesliga, but after less than 48 hours of reflection he has decided to dismiss Kurz.
"After the 4-1 defeat and lots of intensive discussions, we reached the mutual agreement that we had to take this step," Kuntz said on the club's website. "We have introduced many different measures in recent weeks and months devised to bring the team back on the road to success, but unfortunately these have not worked."
Kurz only just signed a one-year contract extension before Christmas, but his side have not won since.
"This is a very difficult step for us all because Marco Kurz dedicated himself fully to the cause and to the club," Kuntz added. "We enjoyed great success with him with promotion in 2010 and the seventh-place finish last season.
"Marco Kurz deserves the highest respect and recognition for his work. To try to exhaust really every imaginable possibility to keep us up, we had to go this way."
Kurz took over in 2009 and led the club to promotion in his very first season, establishing them in the top flight last season with an impressive seventh-place finish.
However, with only eight games left this season, the club's recent run of bad form has left them facing the prospect of relegation back to the second tier.