Officers are examining CCTV footage from the Thalang Shooting Range on Phuket which appears to show the Briton standing alongside a staff member before turning the gun on himself Saturday afternoon.
The visibly distraught employee is seen walking away from the scene holding his head in his hands.
"We are investigating the CCTV images. We have not yet concluded whether it was an accident or suicide," said police Colonel Chanuchan Chonsuwat of Thalang district on the popular resort island, confirming the death.
