Mr Clarke also said while there were several elements that contributed to his wife's death, the certificate indicates it was severe bilateral pneumonia that was the primary cause.
Speaking to The Daily Telegraph, Chase Clarke described Kelly as "a wonderful kind soul", adding "the last thing you expect on your honeymoon is to lose your wife, she had her whole life ahead of her".
'That's not something I ever envisaged doing, that image is now in my mind'.
'Me and Kelly have been through a lot, [she's] been there for me, been my star. "We will all miss her greatly". I will always wonder'.
Mrs Clarke finally succumbed to her illness at 10.40pm on Friday night, less than an hour before a medevac team arrived to airlift her to Sydney.
The family received a death certificate for Mrs Clarke from Fiji authorities on Sunday after an autopsy was undertaken.
She is in a very unstable condition.
"The Department of Foreign Affairs and Trade is providing consular assistance, in accordance with the Consular Services Charter, to the family of an Australian woman who passed away in Fiji", a spokeswoman said.
But now her heartbroken husband Chase is planning her funeral as the family is relieved to have her body home. "Please help us bring her home!"
'I told her I loved her'.
Mr Clarke believed his wife had been vaccinated against typhoid, but she had contracted immune disorder lupus earlier this year.
Ms Clarke, a recently-graduated registered nurse at The Children's Hospital at Westmead, initially complained of stomach pain.
Two days later, and just an hour before she was due to be medically evacuated back to Sydney, Ms Clarke was gone.
"You attractive girl and unbelievable sister you will be deeply missed", he wrote.
It was later confirmed on the fundraising page that costs to transport Kelly's body home will be covered by insurance, and that donations "will go a long way to help the family in the hard times to come".
"We also believe it is important to respect her family's privacy at what must be a hard and distressing time".