The incident occurred in the eighth inning with the game tied at 2. After he struck out swinging to end the top of the eighth, Zimmerman threw his bat and helmet in disgust. He didn't say anything, but home-plate umpire Scott Barry ejected Zimmerman.
It marked the first time in his career that Zimmerman was tossed from a game. Riggleman then argued with Barry for about a minute before being tossed out himself.
It marked the second consecutive game that a Nats player received an ejection. Catcher Ivan Rodriguez was ejected for arguing balls and strikes on Tuesday by third-base umpire Brian Knight.
According to Riggleman and Zimmerman, Barry believed the bat and helmet tossing from Zimmerman was directed at the umpire, but that wasn't the case. Zimmerman said he was simply frustrated at himself for striking out.
"I guess he thought I was throwing the helmet and bat at him," Zimmerman said. "He called the game well the whole game. I was more upset for striking out. That's what it was. It's over with."
"Barry felt Zim had turned to him and threw the bat and all that," said Riggleman. "I think if he looks at it on the replay, he will realize that Zim took his swing and slammed his bat. An equipment fine is appropriate, but not an ejection."
Barry declined to comment after the game.