A four-year-old boy who was killed by his stepfather would have been in extreme pain from the 70 injuries he suffered in the lead up to his death, a court has heard.
Matthew Scown pleaded guilty to the 2009 manslaughter of Tyrell Cobb at the Brisbane Supreme Court on Wednesday.
During submissions ahead of sentencing, the court heard the boy was vomiting green matter on the night he died.
Scown called triple-0 in distress and performed CPR on the boy as paramedics made their way to the Gold Coast home where the pair were staying.
"Looks like he's going to die on me," Scown told the operator, the court heard.
Expert medical evidence from a paediatric surgeon showed Tyrell would have been in "extreme pain" before his death.
Even breathing would have hurt significantly and Tyrell was not able to keep food or water down due to his injuries.
The court heard 53 bruises and 17 abrasions were found on the boy's body, from head to legs.
The end of his life was spent in "misery and pain" the court heard.
During earlier hearings, the court was told Scown punched or kicked the young boy in the stomach before his death, while he was under his care.
Justice Martin Burns continues to hear submissions ahead of an expected sentence later on Wednesday.