Police were notified of the accident at midday. Pol Lt Sumet Chitphet, Deputy Inspector of Investigation at Thalang Police Station, was dispatched to the scene along with rescue workers from the Srisoonthorn Municipality, Kusoldharm Phuket Foundation and an ambulance from Thalang Hospital.
The accident occurred on a narrow road next to the Jee Hong Moo Krob restaurant in Moo 2, Srisoonthorn. At the scene, responders found a damaged pink-and-white Honda Scoopy motorbike lying at the roadside.
Nearby, the driver, Phanom Sae Lim, 41, was found with a laceration to his left chest and abrasions across his body. He was conscious but agitated and was quickly rushed to Thalang Hospital for treatment.
Police said Mr Phanom had been riding down the hill with three passengers on the motorbike: Ms Premrudee Thiratantikul, Ms Yaowalak Thiratantikul, and a young child, later identified as Kwanrudee Intraraksa, aged 2.
Preliminary investigations suggest the motorcycle hit a hole in the road, causing Mr Phanom to lose control of the vehicle. The bike then veered off the damaged roadside and struck a rock, resulting in serious injuries to all four riders.
Nong Kwanrudee was pronounced dead at the hospital.
Police said they were continuing their investigation.
Earlier this morning, a 22-year-old Myanmar man died after losing control of his motorbike on Patak Rd in Chalong and being thrown into an electric pole.
The victim, identified as Aung Pyae Phyo, was found dead at the scene with severe injuries. His motorbike was discovered about 100 metres away.
CCTV footage confirmed he was riding alone when the crash occurred.