Authorities knew a woman killed by her estranged husband on the Gold Coast was in "grave danger of being murdered", prompting questions about whether Queensland's justice system is failing to protect victims.

Weeks before the suspected murder-suicide on Tuesday, David Bradford, 52, had been charged with assaulting and choking his wife Teresa Bradford, 40.

He was taken into custody but granted bail in early January, which was a mistake, a domestic violence support group involved in the case said.

David Bradford, 52, was charged with assaulting his estranged wife weeks before her death. ( Supplied )

DV Connect chief executive officer Diane Mangan said there were clear warning signs that should have been recognised.

She said strangulation was the number one indicator leading to domestic homicide.

"This was definitely a woman who was in grave danger of being murdered. She knew it herself," Ms Mangan said, adding it was one of the more serious cases her staff worked with.

Ms Mangan said the system was working to protect Ms Bradford until her husband was released on bail.

"It was really after the new year where the wheels appear to have come off," she said.

"[David Bradford] really should not have been given bail, based on what I think would have been presented.

"This is a tragedy that we need to learn from. Indicators are there for a reason."

Friends say Teresa let down by system

Ms Bradford's close friend Karina Mason said she did not actually know David Bradford had been granted bail until it had been granted.

"The moment she found out he had been let out, she honestly lived in fear," Ms Mason said.

"How does someone who was facing some pretty serious charges get bail?

A police officer placed flowers, brought over by a neighbour, at Ms Bradford's home. ( AAP: Dan Peled )

"We're sitting here asking: How did this happen?

"Would this have happened if she was in Victoria or New South Wales?"

Attorney-General Yvette D'Ath said it was too early to discuss the circumstances around the individuals involved, including any reports about bail.

"This matter is before the police and may possibly come before the coroner or the Domestic and Family Violence Death Review Board," she said.

"We know from reports that children are involved and our thoughts go out to those children and friends and family at this very difficult time."