"He's an emotional guy," Blue Jays manager John Gibbons said. "We've got a few emotional guys. I can't say that surprises me."
Donaldson then became enraged at the final strike which came on a 92-mph fastball low in the zone. He immediately turned toward Conroy and was promptly ejected as the two men went face to face.
Toronto, leading 3-0, called on Darwin Barney at third base in the bottom of the inning.
Gregor Chisholm has covered the Blue Jays for MLB.com since 2011. Follow him on Twitter @gregorMLB and Facebook, and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.