UPDATE: Murdered Toowoomba teenager Jake Lasker's mother for a moment directly addressed the second man charged with her son's death during his sentence hearing today.

Reading from a victim impact statement, Joanne Lasker told Toowoomba Supreme Court of the heartache the family was left with after her son's brutal stabbing murder in their Rockville Home in November 2012.

Turning to 21-year-old Kyle Mitchell Dumesny in the prisoner's dock, Mrs Lasker said: "We trusted you with Jake, boy were we so wrong."

Jake Lasker
Kyle Mitchell Dumesny was sentenced today over the death of Jake Lasker.

Kyle Mitchell Dumesny was today sentenced to seven years in prison over the stabbing death of Jake Lasker in 2012.

He was charged with murder in May last year more than two years after the murder but pleaded guilty to manslaughter on Monday after the Crown accepted his plea.

Max Peter Smith, now 23, is serving a life sentence after pleading guilty to stabbing Jake more than 102 times, two blows having severed coronary arteries leading to a "rapid death".

Dumesny had exchanged text messages with Smith in the days leading up to the murder, the Crown accusing him of helping plan the killing.

Kyle Dumesny, 19, has been charged with the murder of Jake Lasker. Contributed
Kyle Mitchell Dumesny has been sentenced to jail.

Admitting to the text message exchanges, Dumesny told police he hadn't taken Smith seriously at the time.

Dumesny and Smith had been at the Lasker family's home in Rockville on November 7, 2012, playing Xbox games in Jake's room.

Smith motioned stabbing actions behind Jake's back to Dumesny before Dumesny left the room and went to the toilet.

The Crown accepted Dumesny was not in the room when Smith, having taken a large carving knife from the kitchen, brutally attacked the 19-year-old.

However, Dumesny admitted hearing Jake's screams but instead of going to help him simply left the residence.

He returned a short time later to find Jake Lasker's bloody lifeless body on his bed and Smith with a hand bleeding from cuts sustained during the attack.

He had then taken Smith to a nearby shop seeking help for his injuries.

Crown prosecutor Vicki Loury said it was a feature of Dumesny's offending that he had shown concern for the killer Smith but none for Jake Lasker.

Dumesny's barrister Steve Kissick told the court his client had co-operated with police and, though he had minimised his own involvement, his client had provided a statement for police and had taken part in a re-enactment days after Jake's death.

After his arrest for murder, his client had been remanded in custody but had to be moved to protective custody after word spread that Dumesny had co-operated with police and had been seen as something of a "dog" among prison inmates.

Dumesny pleaded guilty to manslaughter on the grounds he had been a party to a common purpose to assault Jake Lasker and by his plea accepted Jake's death was a "probably consequence".

Justice Peter Lyons noted at the time of the incident Dumesny was just 17, had no previous criminal history whatsoever and was susceptible to the influence of others.

"Your co-operation (with police) is a matter of some importance," he said.

Justice Lyons declared the almost 18 months Dumesny had spent in pre-sentence custody as time already served under the sentence and sentenced him to seven years in jail but ordered he be eligible to apply for release on parole in October next year.

EARLIER: Kyle Mitchell Dumesny was today sentenced to seven years in prison over the stabbing death of Jake Lasker in 2012.

Dumesny plead guilty to one count of manslaughter in the Toowoomba Supreme Court yesterday.

The prosecution accepted Dumesny's plea on the lesser charge of manslaughter during the first day of his murder trial yesterday when he pleaded not guilty to murder.

Dumesny was charged with Jake Lasker's murder in May, 2015.

Co-accused Max Peter Smith was sentenced to life imprisonment in November, 2014, after pleading guilty to murder.

Justice Peter Lyons today sentenced Dumesny to seven years in prison to be eligible to apply for release on parole as of October 25, 2017.

The 18 months he had already spent in pre-sentence custody was declared as time already served.