Police have arrested and charged a 35-year-old Portland Road man with one count each of murder and wounding.
Its alleged around 8.30am yesterday morning, the man joined a 60-year-old man and 65-year-old woman at their camp site when a fight started.
Police will allege the younger man then stabbed the 60-year-old man in the neck, before stabbing the 65-year-old woman in her lower arm.
Officers responded and a man was taken into custody yesterday afternoon.
The man will appear via video link in the Cairns Magistrates Court today.