A Canadian couple who travelled to Mexico for their daughter’s wedding have died while having sex in a resort spa bath.

Charles Mckenzie, 67, and his wife Dorothy 63, were found dead in their room at Playacar Palace hotel in Playa del Carmen, just two days before the ceremony.

It is believed Mr Mckenzie suffered a heart attack, while his wife died from "asphyxiation by submersion" after being squashed by her dying husband, the International Business Times reports.

"I know that they're more concerned about the remains and cremation and things like that,” Mr Mckenzie's brother-in-law Douglas Hastings told Canadian media.

Many rooms at the resort feature a spa bath. Source: Playacar Palace Hotel. More

A hotel spokesperson ruled out the possibility that the pair had been elctocuted in the spa bath.

"The room was perfectly fine. All the equipment was working perfectly. What the family mentioned was a heart attack,” David Rubeo told The Canadian Press.

Rubeo said the couple's family was still staying at the hotel and was being assisted by hotel staff.

"We are treating them as our own family," he said, noting that staff were helping the Canadians deal with local authorities.

"All the group is very calm, in the best way they can be."