Kota Setar police chief Siti Nor Salawati Saad said the teenager collapsed while seated in the stands at around 7pm.

“The teenager, who came to the stadium with his younger brother to watch the football match between KDA FC and JDT, collapsed and lost consciousness while in the stands before the match started.

“Spectators who witnessed the incident immediately contacted the civil defence force on duty at the stadium to transport the teenager to Sultanah Bahiyah Hospital for treatment,” she said in a statement here today.

However, medical officers confirmed that the teenager had died.

Siti Nor Salawati said checks with the family revealed that the teenager had been a heart disease patient since childhood.

She said medical authorities confirmed the cause of death as “complex cyanotic heart disease”.

Earlier, a five-second video clip went viral on social media showing medical personnel at Darul Aman Stadium rushing to carry a teenager on a stretcher.