But Queensland Police said they had finished their investigation and found Wilson's injuries were consistent with a fall on to powerlines.
"As part of the investigation, police interviewed a number of people and reviewed CCTV footage from a nearby business.
"The investigation - which canvassed many different scenarios - has identified that no one else was involved in this matter, and is therefore considered non-suspicious."
The couple, who had been visiting family and travelling along Australia's east coast, have been married for three years, tying the knot after gay marriage was made legal in New Zealand.
They have three adopted children and have also helped raise 15 foster children.
- additional reporting Daily Mail