Disturbing twist after South Australian police chief's son dies in alleged hit and run during schoolies

Cruel online trolls have launched a vile attack on South Australia's Police Commissioner after his 18-year-old son was killed in an alleged hit-and-run schoolies crash.

Charlie Stevens, 18, was allegedly struck by a car on Beach Road in Goolwa Beach, about 84km south of Adelaide at about 9pm on Friday.

Charlie, whose father is South Australia's Police Commissioner Grant Stevens, had been in the area celebrating schoolies week with friends.

The teen was flown to Flinders Medical Centre, where it was found he sustained an 'irreversible brain injury', before sadly passing away on Saturday at about 7pm.

Adding an additional layer of pain to an already grieving family, former outlaw bikie club president Mehmet Erhan used Charlie's death as an opportunity to call out the police commissioner.

'No parent, or parents should witness in their lifetime their child being murdered, being hurt, being removed from their home unnecessarily,' Erhan said.

'It's unfortunate, however, Mr Stevens is behind South Australia police, which are also guilty for the removal of children unnecessarily, the deaths of many women, children and men, especially incarcerated and especially the Indigenous.

'I'm not saying that it's justifiable, but what I am saying is, you do wrong in this world, it comes back to you, and that's just how it is.

'Hopefully, this situation humbles you [Stevens]. It's not a good thing, so I do hope South Australia police do capture the person that caused this. Such is life.'

Many Aussies called out the bikie president over the sickening attack.

'This is your opinion you keep it to yourself. His family and friends are traumatised and grieving and don't wanna hear this bs. Have some compassion,' one said.

'The deaths of someone's child is not an opportunity to prove a point mate. No matter who he is,' another added.

The teenage driver accused of killing Charlie and leaving him on the road to die was identified as 18-year-old Dhirren Randhawa. 

Randhawa, 18, an apprentice barber from Encounter Bay,  allegedly did not stop at the scene, but was pulled over by police a short distance away on Port Elliot Rd.

He was arrested and charged with causing harm by dangerous driving, aggravated driving without due care, leaving the scene of a serious crash and failing to truly answer questions.

Two of the charges have been since been upgraded to causing death by dangerous driving and leaving the scene of a crash after causing death.

 Tributes are flowing for Charlie, who had just begun work as an apprentice carpenter after leaving school last year. 

One family friend said Charlie would now be with his aunt Belinda.

'Rest easy up there Charlie,' she wrote online.

'I'm sure Belsy will look after you.' 

Charlie's mother Emma shared a heartbreaking post on Facebook, writing: 'Forever 18 my beautiful boy, going to miss you and love you for ever.'

His devastated older brother Tom said he would now be 'forever young'. 

'My best mate, my biggest rival, my number one fan, my little brother Charlie,' he wrote on Instagram. 

'It breaks my heart my days of being a big brother have come to an end, forever in our hearts, forever young and beautiful.'

The three-day schoolies festival had just kicked off on Friday night when Charlie was allegedly struck in Goolwa, right near a bus station set up to take revellers to festivities in nearby Victor Harbour. 

Witnesses have recalled hearing people yelling for 'help' as his distraught friends tried to save his life.

Randhawa's mother broke her silence on Saturday afternoon to offer her condolences to the Stevens family. 

'I extend my deepest possible sympathies to the Stevens family and my heart is breaking to think of the suffering and pain they are experiencing,' she said in a statement.

'Out of respect and acknowledging that this is now a matter for the courts, I won't be saying anything further at this time.'

Floral tributes have begun to amass at the scene of the alleged crash as mourners pay their respects to the teenager, who was the youngest of five children.

Daily Mail Australia understands Commissioner Stevens will take indefinite leave to be with his family as they grieve. 

In a family statement from Sunday night shared by SA Police, Commissioner Stevens and Mrs Stevens thanked the police, first responders and other emergency services workers who attended the incident.

'The Stevens family also wish to thank the wider community for their support during this difficult time in particular the family acknowledge the dedicated staff at the Flinders Medical Centre for their care and support of Charlie and his family and friends.'

Randhawa is due to face Christies Beach Magistrates Court on Monday.