Shannon Amy Guy, from Carleton Place, Ont., near Ottawa, was married to Paul Guy on Aug. 2.
They travelled to Tulum, Mexico, on Wednesday and were staying at the Oasis Tulum resort south of Cancun.
A friend told CBC News on Friday that Paul Guy was taking photographs of his wife and another Canadian couple they had met at the resort when the balcony of a honeymoon suite collapsed.
Paul Guy was not hurt, but his wife and the couple fell to the ground.
They had been transferred into the honeymoon suite, the friend said.
In an emailed statement, a spokesman for the Department of Foreign Affairs, Trade and Development said, "Our thoughts and deepest sympathies are with the family and friends of the Canadian who passed away and the 2 other Canadians who were injured.
"Canadian consular officials in Mexico are in contact with local authorities to gather additional information and are providing consular assistance to those affected," the spokesman said.
More to come