Sathien Arsa waited for police with his homemade rifle in his hand at 5pm after he allegedly killed his son, Porn Arsa, 38, at his house in Moo 5 village in Tambon Chiang Muan in Chiang Muan district. Sathien, who now faces a murder charge, told police that his son was high on meth and set fire to their house but neighbours helped put out the fire. Sathien said his son then tried to attack him and his wife with a knife so he had to shoot him to defend himself. Sathien said his son was unemployed after he got a bachelor’s degree. Sathien said his son lived with his wife and eight-year-old daughter but Porn often quarrelled with his wife, prompting her to leave him earlier.