Tyrell Cobb showed up to school with a bandaged hand. Two days later, he was dead.

Gold Coast mother Heidi Strbak was on Monday sentenced to nine years prison for the manslaughter of her four-year-old son Tyrell Cobb in 2009.

“I loved him more than I could possibly describe,” Strbak, 36, said as her sentence was handed down, the ABC reports. “When he was taken away from me, I lost my life as well.”

Four-year-old Tyrell was ‘taken’ from his mother over the course of a weekend. He left kindergarten on Friday, May 22, 2009 never to return. When he was taken to hospital two days later, on Sunday night, his body was covered with more than 70 bruises. He was unconscious. There were bruises on his ear, and a cigarette burn on his ankle.

He died from blunt force trauma to the abdomen.

“The last hours of his life must have been miserable and painful,” Justice Applegarth told the court, News Corp reports.

“I have not caused the injuries that I have been blamed for. I believe it’s a mistake,” Strbak told the courtroom.

The court heard that Strbak hit Tyrell across the face on Friday evening after picking him up from daycare, because he’d vomited. And that she wouldn’t take him to receive medical help on Saturday, even though he was unwell, and went instead to pick up cannabis.

Despite his violent death, there were no suspicious circumstances that might have led Tyrell's teachers to believe something was wrong at home, the court heard. According to reports from the ABC he was a well-dressed boy and always carried the healthiest lunch.

In the week before he died, he was wearing a bandage on his hand because his finger had become infected after he jammed it in a toy box. While receiving treatment for the infection at hospital, nurses did not notice any unusual markings on the four-year old's body, the ABC reports.

She was a "good mother when she was stoned", Strbak's partner at the time Matthew Scown said while giving evidence.

LISTEN: The Mamamia Out Loud team discuss the recording of police coaxing a confession from Daniel Morcombe's killer. Post continues after.

Scown was with the pair over the weekend Tyrell was killed. He was also the person who called the ambulance when he checked on the four-year-old in the night - after hearing a gargling sound - and finding him unresponsive.

He walked free from court in October after serving two years and eight months behind bars and being handed a four-year suspended sentence. As he left the building he was photographed smiling at the cameras, making headlines because of his apparent insensitivity - doesn't he realise, a little boy is dead?

The premier of Queensland, even, Annastacia Palaszczuk told media she would ask the Attourney-General to review Scown's sentence because of his lack of remorse.

In the eight years since Tyrell's death, Strbak has maintained she did not strike her son. She pleaded guilty to manslaughter - understanding that if she'd taken Tyrell to the hospital earlier, he wouldn't have died.

But she has always denied being the person to cause the injuries.

"You’ve lied half your life ... you know how to lie," Strbak's brother told her over text message while the pair were discussing the case, The Courier Mail reports.

The prosecution showed the court how she became aggressive when she was deprived of cannabis. That she'd lied to her family about the extent of her addiction. That she lied to the police. That she had refused to take her son, who had been throwing up green bile for more than 48 hours, to the hospital.

The coroner found the first major injury to Tyrell's stomach occurred somewhere between 24 to 48 hours before he died. The second major blow was inflicted only hours before his death. The 70 other bruises and abrasions were inconsistent with regular four-year-old accidents.

"You were Tyrell's mother, with a primary duty for his care. You knew if Tyrell was taken to hospital, and the source of his injuries was investigated, you would be held responsible for his neglect," Justice Peter Applegarth said at the sentencing.

During the trial, Tyrell's father Jason Cobb left the courtroom after giving evidence and slammed the door so hard the glass shattered, the ABC reports.

"If they’re responsible, they can rot in hell," Cobb told Channel Nine's A Current Affair on Monday night, labelling Strbak and her former partner "disgusting people".

"She can go to jail and I’ll be happy," he said. "Not happy, but happy for Tyrell."

Heartbreakingly, Cobb received a phone call the weekend Tyrell died. It was Strbak telling him she "couldn't handle him [Tyrell] no more" and could he please come to pick him up?

Cobb lived a 10-hour drive away and decided he'd call Strbak the next morning to see if things had improved. He didn't yet know how much the poor boy was suffering, that he would never see his son again.

Strbak will serve four years in custody before being eligible for parole.