Mark said: "We passed them two or three times every day in the courtroom and (Anita) would often stare at Caroline and me as if it was our fault that Turner was there. It was quite remarkable."
During the case the court heard a recording of a "chilling" call made to emergency services by Turner's mother - more than 30 minutes after she discovered the body.
"When we started none of us knew the extent of it but as the case unfolded and we heard the call I thought 'I hope you go to prison because it was the most callous and inhumane display I had ever seen'," said Mark.
"I found (the parents) very arrogant, cocky, everything was everybody else's fault and I can't fathom it."
He said the father appeared to have been convinced to pervert the course of justice by his wife, from whom he is now estranged.
Such was the level of secrecy around the police case against Turner that Mark only learned how his daughter died when it was detailed in the prosecution's opening.
The hardest times for the Longleys were when they learned of the horrific strangulation, hearing of Turner's seething rage towards their helpless daughter, and realising that despite all the warning signs, no one intervened to save Emily.
Throughout the trial, the Longleys kept a promise to maintain an air of dignity to honour Emily's memory.
