A man who was allegedly assaulted by up to four men at Adelaide High School has died in hospital.
The 24-year-old was dropped off at Royal Adelaide Hospital with serious head injuries on the night of August 28 following the attack in the school car park.
Police say the Ridleyton man died on Saturday.
They have charged a 23-year-old Adelaide man with aggravated assault causing serious harm, which is now expected to be upgraded.
Detectives believe the 24-year-old may have visited the Welland Shopping Centre car park earlier on August 28.
Anyone who has dashcam footage or who may have seen suspicious activity at the centre or the school is urged to contact police.