The 16-year-old had collapsed during rugby practice at Alexandra High School, ER24 spokesperson Annine Dormehl said.
Paramedics performed CPR and placed him on a ventilator to take him to hospital.
Once at the hospital, doctors continued with CPR, but he did not pull through.
He was declared dead at 18:00.
Authorities would investigate the circumstances of his death.
Source: News24
