The short 21-month life of Mason Jet Lee was plagued with pain and suffering, from severe anal injuries to a fractured leg and a blow to the stomach that would eventually cause his death.
His stepfather, William Andrew O'Sullivan, was sentenced last month to nine years in prison for his involvement in the boy's death in June 2016.
Mason's extensive injuries and illnesses dated back to months before his lifeless body was found in a house in Caboolture, north of Brisbane.
The courts had already heard how Mason had missed medical appointments, sent him home after a long stay, took him to McDonald's at 3am and left him alone at home with a five-year-old boy while his stepfather was going to have sex.
Scroll down to watch the video
Mason Jet Lee (pictured) who died at the hands of his stepfather suffered a slow and painful death, as it was revealed that he could have suffered his injuries five days before he died.
Mason's stepfather, William Andrew O'Sullivan, was sentenced to nine years in prison for his participation in the boy's death in June 2016.
The Courier-Mail previously reported how a court had heard that O & # 39; Sullivan had left Mason at home with a five-year-old child the night the baby died.
The court had been informed that the CCTV images had captured O & # 39; Sullivan leaving the house after 10 p.m. and returning with a friend at 11.30 p.m.
O 'Sullivan had left the house to have sex, they told the court.
The publication also reported earlier that when Mason was found dead by paramedics, he had scars and bruises and wore only a shirt that was stained with vomit and feces.
He had been dead for hours before a triple zero call was made, with paramedics crying on the street when they faced Mason's horrific wounds, as previously reported.
O & # 39; Sullivan pleaded guilty to four separate charges before the Queensland Supreme Court, including murder and cruelty against a 16-year-old minor.
Supreme Court Chief Justice Catherine Holmes said that if Mason Jet Lee (pictured) had been treated, he would probably have survived
Mason was subjected to continuous and severe mistreatment and neglect during his short life, in which the Supreme Court president, Catherine Holmes, described his state at the time of death as "miserable and painful."
"He was not treated with kindness or kindness, and worse, he did nothing to get help for him despite what would have been his obvious anguish," he said in sentencing O & # 39; Sullivan in the Queensland Supreme Court.
A post mortem examination revealed that Mason had multiple injuries at the time of his death, including a fractured leg, a broken coccyx and a small bowel rupture that slowly poisoned him as he leaked the stool into his abdomen.
In addition to the injuries, traces of methamphetamine were found in his blood.
Mason Jet Lee suffered extensive injuries and illnesses in the months leading up to his death
A post-mortem examination revealed that Mason Jet Lee (pictured) had multiple injuries at the time of his death
Judge Holmes said that O & # 39; Sullivan, a self-confessed "crack addict", was probably under the influence of drugs when it came to offending.
A confinement hearing heard that the child suffered a rupture in the small intestine, which is believed to have been caused by a forceful force trauma.
In the months prior to his death, Mason was treated for multiple injuries and was admitted to the Lady Cilento Children's Hospital for three weeks in February 2016, a court was previously informed.
That was for the treatment of an abscess in Mason's right leg, but doctors soon discovered he had a "chronic" and "extensive" rash around his genitals, including deep abscesses, the court was told.
INJURIES AND EXTENSIVE DISEASES OF MASON JET LEE
Cellulitis – probably caused by an insect bite that became infected
Prolapse of the anus – probably due to internal pressure of the abdominal passage or large, hard stools
Jacquet's dermatitis – rare form of diaper rash
Broken leg – He made Mason limp, probably caused by a children's game
Ulcers in the mouth
Perforated duodenum (a segment of the small intestine) – caused death after vomiting, abdominal pain, fever. The people who saw him described him as pale, with bad looks and dark eyes looking blankly
Peritonitis – inflammation of the membrane lining the abdominal wall
Septicemia – allowed fecal matter to fatally contaminate your bloodstream
Fractured coccyx – Found at the autopsy. The persecution he speculated was caused by kicks
Bruises – caused by the fingertips to the forehead, jaw, thorax and abdomen
Source – AAP
Mason would have been unable to eat or drink without vomiting in his last hours and when the paramedics attended to him, at least half an hour after his death, he was covered in bruises and vomiting, the audience was told.
Judge Holmes took into account the assault to which O & # 39; Sullivan was put in prison while awaiting sentencing.
He was sentenced to nine years in prison with a term of four years without parole, which means he will be eligible for release in 2022.