Pol Lt Gen Panya Pinsuk, 59, commander of the Royal Thai Police Office, was found shot dead at his home on Sunday afternoon and the Bangkok police chief said his wife killed him out of stress.
The death was reported to local police at 1.45pm. The incident happened in Thawi Watthana district.
Police found the body lying beside a silver Toyota parked in front of the house. There were bullet wounds to the right side of the chest and at a collar bone.
In one of the rooms in the house, police found a revolver on a cupboard and a Glock pistol on the floor near a pool of blood.
Police learned that before his death, Panya was with his wife inside the house, and she was the one who first saw the body.
The Bangkok police chief said the incident came from tension concerning a family matter, resulting in the wife shooting her husband. Police brought her out of the house in a state of shock. There was no trace of a struggle in the house.