Queensland Police said they found human remains, in addition to clothing and a walking stick belonging to Anne Cameron, who was reported missing Tuesday from a facility in Port Douglas, Sky News Australia reported.
Anne Cameron was last seen near an aged care facility in Port Douglas on Tuesday afternoon and her family believe she passed away in "tragic circumstances".
Clothes and a walking stick bearing the name of Ms Cameron, who suffers from dementia, were found next to a creek.
A crocodile in Arnhem land.
A major search has been underway since yesterday with the clothing items located at the isolated creek today.
'We located some biological matter which we believe to be human remains.
"Those items are now being tested in Cairns and we expect to see results tonight or tomorrow".
"We strongly suspect now that there has been involvement of a crocodile attack", Acting Inspector Ed Lukin said.
Ozcare, the company that runs the aged care facility, declined to comment.
A former neighbour of Mrs Cameron said she had moved to Port Douglas from Canberra, where she had lived most of her life, within the past year in order to be closer to her family.
The woman's son, Craig Eggins, wrote on Facebook his mother took regular short walks and would ask for help if she got lost, according to the Australian Associated Press.
The Australian Broadcasting Corporation reported the beach was closed in April when a four-metre croc was spotted swimming offshore, while there had been several attacks by the reptiles on dogs in the area this year.
Lee de Paauw, 18, injured after he was dared to jump into an Innisfail river in the middle of the night.
Police have not ruled out finding Cameron alive and are still searching the area.
A saltwater crocodile in Kakadu National Park, Northern Territory. His mate was trapped for three hours and was rescued after throwing spanners and spark plugs at the croc.