The Pirates announced Sunday that manager Clint Hurdle has been relieved of his duties and will not return after nine seasons with the club.
Ken Rosenthal of The Athletic was the first to report that Hurdle was on his way out. General manager Neal Huntington will remain in his role.
Pittsburgh is 69-92 entering the final game of the season against the Reds and is in danger falling short of 70 wins for the first time since 2010, the last season before Hurdle took over.
The club went 57-105 in that season before Hurdle's arrival and turned into a playoff team by his third season.