A Greek man will marry his Australian sweetheart tomorrow week thanks to another heart - the one donated to him by Maltese-Australian Doujon Zammit.

Twenty-year-old Doujon was bashed to death outside a disco/nightclub in Greece in July last year and a bouncer has been charged with the crime.

In keeping with their son's wishes, Doujon's parents had agreed to donate his organs.

His heart went to Kostas Gribilas, a Sydney-born Greek man who had been preparing to marry his Australian fiancee in Athens when he became seriously ill. The couple had a rushed civil marriage, but have since dreamed of a proper ceremony.

The details of the organ donation somehow became public, and Kostas has since been in close contact with Doujon's parents.

Doujon's father, Oliver, will be the best man at the wedding in Sydney.

The marriage is being given prominence in the Australian media.

"I owe the parents of Doujon not one thank you but 1000," Kostas was quoted saying by the Daily Telegraph of Australia.

He also paid tribute to Doujon on his Facebook page.

"Today I live because Doujon was an organ donor," he wrote.

"R.I.P my guardian angel."