An Adelaide father of three who plunged to his death from a rainforest zip line in Queensland's far north has been remembered as a "loving husband, father, son, brother and friend".
Dean Sanderson, 50, was harnessed to wife Shannon, 48, when they fell from the flying fox run by Jungle Surfing Canopy Tours at Cape Tribulation about 2pm on Tuesday.
American couple Samantha Salyer and Joseph Maghe said they had just finished the same section of the Daintree rainforest tour and saw the couple fall.
"We got to the fifth platform and there were two couples behind us," they told the Seven Network.
"There was a loud noise, we turned around, one of the lines had snapped and we saw them fall.
"It shook the entire tree we were on. They hung there, then they both came down at the same time."
Mr Sanderson was pronounced dead at the scene, at Camelot Close, north of Cairns.
His wife was flown by rescue helicopter at 5.30pm to the Cairns Hospital in a serious but stable condition.
She remains there on Wednesday with suspected pelvic injuries and injuries to her shoulder and arm.
In a statement released to News Australia, the family thanked emergency services and the Cairns hospital for their support.
"Our family is mourning the tragic loss of our husband, father and great friend Dean Sanderson after an accident at Cape Tribulation in Queensland," it read.
"We remember Dean as a loving husband, father, son, brother and friend to all."
Phoebe Kitto, a Director of Jungle Surfing, has offered her deepest sympathy to the families and friends of those affected by the accident.
"It will be thoroughly investigated by Workplace Health & Safety, which will receive our full cooperation," she said.
"We are offering counselling to staff and to our patrons."
The zip line takes people through the world renowned Daintree rainforest.
In 2004, an English tourist suffered permanent brain damage after plunging 30m on the same attraction when she was not properly secured in the harness.
Two Workplace Health and Safety officers and an inspector are investigating on Wednesday.
Detectives and Workplace Health and Safety will prepare reports for the coroner.
Australian Associated Press