KLANG, Malaysia - The 22-year-old Universiti Tenaga Nasional student Gary Leon Robert who was found dead at the Shah Alam stadium on Monday had died due to severe dehydration.

His uncle, known only as Ng Chuen, said the organisers had probably not provided sufficient water for the runners in the marathon.

The family was still undecided whether or not to institute legal action against the organiser, Ng told reporters at the Tengku Ampuan Rahimah Hospital (HTAR) mortuary Tuesday.

Gary Leon had collapsed in one of the stadium's tunnels on Sunday after completing a 22km run in the Adidas King of the Road marathon event organised by Adidas and the Shah Alam City Council.

The electronics and electrical engineering student had participated in the event with two of his friends who had also completed the run.

He had sprinted ahead of the two but when he failed to turn-up at their designated meeting place after the run his worried friends searched for him and informed his family that he was missing.

Gary Leon's father Marry Robert had lodged a police report at the Section 11 police station on Sunday after he was alerted of his disappearance.