"It is important that we make every effort to try to improve our bullpen performance," Brewers general manager Doug Melvin said in a statement.
"While Stan is not solely responsible, I felt that this change was the first step and was necessary. Stan has been a loyal member of the Milwaukee Brewers organization for 11 years. His hard work and dedication has been an integral part of the Brewers’ success and is greatly appreciated. His professionalism, personality and knowledge will be missed."
Lee Tunnell will assume Kyles' former duties on an interim basis, according to the report. He's been in his current role with the Brewers since 2009, and has had stints coaching and scouting the Reds' minor league system (2006-2008) and coached within the Rangers' system before that (1997-2005).
McCalvy notes that the Brewers have struggled with their bullpen this season, blowing the most saves and recording the most losses in the majors, and have collectively earned a 4.80 ERA on the season -- ranking the unit 28th overall.