Brett Peter Cowan was last week sentenced to life behind bars for the indecent treatment and murder of the 13-year-old schoolboy on Queensland’s Sunshine Coast in 2003.

The couple told Channel Nine last night that Cowan is a lying paedophile who should have been kept in jail for the crimes he committed prior to their son Daniel’s murder.

Denise Morcombe says law makers have to do a lot more to protect children.

“If he had never been allowed out of jail we wouldn’t be sitting here today,” she said.

“Daniel would still be alive – this would never have happened.

“I think once they have offended the first time and been charged and found guilty for that offence, they should be on the register from day one.”

Bruce and Denise Morcombe say they will never forgive Cowan.

The Morcombes say hope the 44-year-old dies in jail

Bruce Morcombe says Cowan is a lying paedophile.

“He has committed the most heinous of crimes,” he said.

“You do not offend against our children – you do not abduct them and you do not attempt to sexually assault them and you certainly do not kill them, and then after all of that, show no remorse.

“That’s why there is no forgiveness because he has had no remorse to the family – stuff him.”

The couple also say they do not believe Cowan’s confession is the entire truth.

Mr Morcombe says the story Cowan gave to undercover police does not entirely stack up.

“You have got to assess what you can check, what you can verify, but what he actually did – nothing stacks up,” he said.

“Why didn’t Daniel have clothes on – I don’t understand that?

“Why wasn’t Daniel’s belt looped through his pants – was he bound up in his belt?

“Really we don’t want to go there – it’s best we don’t know.”

The couple say they hope law enforcers learn from their story and never give up on cases.

Mr Morcombe says he wants every police officer in the country to do more to solve crimes.

“We were never going to go away and we hope that our attitude has inspired some of those police officers along the journey that have been frustrated and thought this is never going to go anywhere, ‘let’s shelve it, let’s turn it into a cold case’,” he said.

“We said ‘no, no, no – we haven’t finished yet – keep going guys’.”