UPDATE: The grieving family of a 32-year-old dentist who died after finishing the City to Surf fun run say he lived life to the fullest and "ran a good race".
Jeffrey Ong had a suspected heart attack seconds after finishing the 12km run in one hour seven minutes on Sunday.
He was just metres from paramedics, who tried desperately to revive him for more than 40 minutes before he was declared dead on arrival at Sir Charles Gairdner Hospital.
His family said Dr Ong was a wonderful man "who touched so many lives with his love, loyalty, laughter and generosity".
"Jeffrey has run a good race. He has finished his marathon of life. Giving it his all, till he had nothing left to give," they said.
Dr Ong's wife Rachel Chew finished the race 18 minutes after her husband.
His death is the second at the event in three years after 30-year-old French runner Vincent Maudieu died in 2011.
Like Dr Ong, Mr Maudieu collapsed near the finish from a suspect heart attack.
Dr Ong and Dr Chew also ran in the HBF Run for a Reason in May when he finished that 12km course nearly seven minutes faster.
The Nedlands dentist was working one day a week at Dr John Moran and Associates dental clinic while completing postgraduate studies at the University of WA and lecturing. He spent eight years as a dentist for the Australian Defence Force.
Dr Ong's family said their loving son, brother and husband had a positive effect on many people.
They were comforted by their faith and believed he was now in heaven.
"We love and miss you dearly Jeffrey, but know that you are rejoicing in heaven. Till that day we meet again Jeff. God bless you," they said.
Colleagues at the clinic said Dr Ong was "calm, genuine, friendly and warm-spirited" and always had a smile on his face. He had been working there on Saturdays for more than three years.
"He was a remarkable individual and an exceptional dentist, all the patients loved him," they said.
"Jeff was an asset to our business.
"He was adored and admired by all the staff and will be missed greatly.
"Our thoughts and prayers are with his wife Rachel and family."
Australian Medical Association WA president Dr Richard Choong said deaths of young fit men were often totally unexpected and runners needed to recognise the significance of unexpected pain while exercising.
City to Surf organisers expressed sincere condolences to Dr Ong's family.Dr Ong’s family have established a memorial fund. Those wishing to donate can deposit money into the family’s National Australia Bank account:
Name – Arthur Ong
BSB – 086 164
Account Number - 948268204