Robert Ian Trebeck has been found guilty of the murder of Alexis Jeffery in Goondiwindi two years ago.
Mr Trebeck strangled Ms Jeffery to death with her own jeans on the banks of the Macintyre River on morning of the 16th of March 2014.
The Toowoomba Chronical reports Mr Trebeck showed no emotion and stood with his hands in his pockets as he was sentenced to life in prison by Justice Glenn Martin.
In sentencing Mr Trebeck, Justice Martin said he had shown no remorse, he had lied to his family and the Police, and he had tried to pin the crime on someone else.
The Chronical also reports Trebeck had previous convictions for breaches of domestic violence orders, a fact kept from the jury.
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