The courageous words from Mia Ayliffe-Chung's mum after her killer escapes without trial.

This week Rosie Ayliffe learned that her daughter Mia Ayliffe-Chung’s killer would not be standing trial for her death and would not be punished for it.

At first, the British mum was outraged that Frenchman Smail Ayad’s mentally ill state kept him from being found guilty of two counts of murder. But then she paused, and penned a powerful Facebook post.

“I know you will be wishing him and his family pain, and anguish and death,” Rosie wrote to her followers on Facebook after the Brisbane court hearing on Thursday, reports.

“I understand those thoughts because there was a moment yesterday when I wanted that too.

“Then I suddenly realised what was happening to me. I was becoming Ayad.

“I was developing a paranoid, delusional conspiracy theory in my head which was taking me along the path he trod. It was a dark place.”

Rosie, who has been campaigning for changes to Australia’s visa requirements since her daughter’s death in August 2016, said it was thinking of Mia that shook her from her state of rage.

“I stopped, and I reconnected with who I am, and who Mia was.”

Her words come after judge Justice Jean Dalton at Brisbane Mental Health Court discontinued criminal proceedings against Ayad.  She found he was suffering paranoid schizophrenia at the time of the attack, based on the assessments of four psychiatrists and the evidence heard.

Stewart Cormack spoke of the type of person his step-daughter was shortly after her death in 2016. Post continues.

Video by Seven News

Ayad was under the delusion that 50 local farmers and hostel staff wanted to kill him and would burn his body in a pizza oven when he dragged the British backpacker from her bed at the Home Hill hostel and stabbed her multiple times.

After a manager tried to stop him and he jumped from the balcony, Ayad returned to the room and repeatedly stabbed British backpacker Tom Jackson as he tried to help the 20-year-old.

“He thought that a cleaner at the hostel had told him he would be killed when he went to check out and he thought the owner of the hostel was making excuses as to why he couldn’t leave,” Justice Dalton said.

“He interpreted her as telling him that he had to die.”

The court heard Ayad will be detained in a mental health facility before he will likely be repatriated to France.

-With AAP.