The man, who was 29, collapsed after completing 20km out of the 21km race. The organisers have not released his identity as they need to notify his family.

“We are working with all the stakeholders with regards to that but our main priority and focus is on the family, and we are working with them to see how they can be fully supported, doing everything we can possibly do.

“We’ve done everything we possibly can for the family, and we’ll continue to support the family,” Ironman Asia’s managing director Geoff Meyer was quoted as saying by the Singapore daily.

He added that the runner was attended to immediately and sent to the hospital in an ambulance.

This is the third death to have occurred in a long-distance running event in the island republic over the last five years.

In 2011, a 22-year-old Singaporean was able to complete the half-marathon at the Standard Chartered Singapore Marathon but died shortly after.

According to Straits Times, a coroner’s court had later concluded the man died from acute coronary insufficiency and had an abnormal coronary artery which had been previously undetected.

Meanwhile, in 2013, a 25-year-old runner collapsed and died while taking part in a 10km race.

The man, who was a taekwondo exponent, had collapsed while running the 10km Nike We Run. He was taken to hospital but died later the same day.