Tributes flow for SA father and veteran Paul Miller who died during Kokoda Track walk

Australian veteran Paul Miller, who had been walking the Kokoda Track when he suffered a fatal suspected heart attack. (Facebook)

A South Australian veteran who died during a fundraising walk along the Kokoda Track in Papua New Guinea is being remembered as a "loving" father of five.

Paul Miller had been walking the path with his son when he suffered what is believed to have been a heart attack.