Drink driver Akol Agui Akol has read a heartfelt apology in court over the death of his girlfriend — who died during a high-speed street race — questioning how he will ever hold his head up high in the community again.

Key points: Akol has previously pleaded guilty to dangerous driving causing death

Akol has previously pleaded guilty to dangerous driving causing death He returned a positive blood alcohol reading and had drugs in his system

He returned a positive blood alcohol reading and had drugs in his system Bor Mabil was not wearing a seatbelt at the time of the crash

However, his apology fell on deaf ears as the family of Bor Mabil refused to listen and left the courtroom, returning once he had finished.

Akol, 19, has previously pleaded guilty to aggravated dangerous driving causing death and faced a pre-sentencing hearing before District Court Judge Paul Slattery on Wednesday.

The court heard he was drink and drug driving when he was allegedly involved in a street race with another driver, Alakiir Kelei Deng, before losing control of the vehicle at Andrews Farm in January.

Akol returned a blood alcohol reading of 0.22 and also had MDMA in his system.

Ms Mabil — who is the sister of Socceroos' star Awer Mabil and the friend of model Adut Akech — was not wearing a seatbelt and died in Akol's lap.

In his apology, Akol said his decision to drive that night would "haunt him for life".

"Knowing that I will be released from incarceration in the future, I have no idea how I will hold my head up high in our community," he said.

"Always with the realisation that I have caused the death of someone I care about …"

Family still 'struggling to accept' death

Prosecutor Leah O'Donnell read six victim impact statements by members of Ms Mabil's distraught family.

In her statement, Ms Mabil's mother Agot Dauatm said her family had been changed forever.

Bor Mabil was killed in a road crash in Adelaide's north. ( Supplied )

"Every single day, I blame myself for the death of my child because if I did not go to Africa to visit my frail, elderly mother, my child would not have been killed," she said.

"I believe something like this could only be because of witchcraft — since 2015, weird things have been done to my family.

"Only God knows what happened — my daughter is dead.

"Every day since my child died, I cannot spend more than 30 minutes without thinking and crying about her death.

"My six and nine-year-old sons now ask me when Bor will return from heaven because she has rested enough to return to us.

"My two oldest sons are struggling to accept Bor's death."

Ms Mabil's brother, Awer Gabrlel Bul, told the court the family had been in a state of grief.

"They have no Bor to laugh with, they have no Bor to help them with homework, they have no Bor to take them to school," he said.

"The last time I chatted with Awer Mabil, this is my brother who plays for the Socceroos and in Denmark, he said 'I will never forget Bor and I don't want to be reminded about Bor'."

Akol was disqualified from driving

In her submissions, Ms O'Donnell said Akol had been disqualified from driving after being involved in an alcohol-fuelled crash in September 2018.

The white Audi sedan in which Bor Mabil was killed. ( ABC News )

He was driving down the wrong side of the Northern Expressway and crashed head-on with another vehicle, knocking the driver unconscious.

Akol's lawyer Jason Evitts told the court that his client was feeling deep grief and shame for his actions that killed Ms Mabil.

"There is no doubt that the driving was dangerous," he said.

Akol will be sentenced in February next year.

In the Adelaide Magistrates Court today, Alakiir Kelei Deng pleaded not guilty to aggravated dangerous driving causing death and was committed to face trial in the District Court next year.