UPDATED 9.13AM: Human remains were found inside a 4.3m crocodile, which was put to death in Queensland.

The animal was captured after New Zealand born Cindy Waldron was taken at Thornton Beach on Saturday night.

It was believed the remains were hers.

The crocodile was caught and put down not far from the beach yesterday, and the remains were found when the dead animal was taken to Cairns.

"The 4.3m estuarine crocodile was humanely euthanised. It is being transported to a secure EHP facility in Cairns," Queensland police said in a statement on Friday evening.

It was the second crocodile removed as part of the investigation into the death of Waldron, 46, who was dragged underwater at Thornton Beach after venturing into the waist-deep water with friend Leeann Mitchell last Sunday night.

Police had earlier requested the remains of another crocodile, smaller at 2.5 metres, trapped in one of three caged devices be examined.

The animal's stomach contents were "unidentifiable" and required further analysis.

A longtime NSW resident, Waldron's father Pat and sister Anna-Lee Annett flew to Cairns from New Zealand earlier this week to be closer to where she spent her final days.

They made an emotional visit to Thornton Beach to say goodbye after expressing gratitude for the massive search effort.

"We need to be here and cry on the beach," said Mr Waldron, who did not want the crocodile harmed.

"There's signs everywhere - don't go swimming with the crocodiles.

"She'd do crazy things. And what she did there is a crazy thing, absolutely."

The fatal attack has prompted the state government to allocate an extra $5.8 million over three years for comprehensive population surveys and crocodile management.