According to the newspaper Tribuna de la Bahia, Baroni summoned police and said the woman had slipped and hit her head after he threw her into the shower.
It was not clear if Baroni had a lawyer.
It was the second recent violent incident for the UFC in Mexico. UFC President Dana White was seen on video released by TMZ slapping his wife, Anne, while the two were on vacation in Cabo San Lucas, Mexico, last month.
White told TMZ in an interview this week that he was “embarrassed” and concerned for how his three children were affected.
“You’ve heard me say for years, ‘There’s never ever an excuse for a guy to put his hands on a woman,’ and now here I am on TMZ talking about it,” White told the website.