Brief killing interlude A young man addicted to drugs brutally killed his grandmother before returning to hand-washing his clothes as if nothing happened. Weluwan police in Khon Kaen last week nabbed Phumiphat “Chokul” Thasa, 18, after he attacked his grandma, Mayuri “Joi” Sopawong, 63, with a chopping knife in her bedroom. The victim’s husband and the young man’s grandad, Wai Sopawong, 67, suspects Chokul broke into her bedroom to ask his grandma for money to feed his drug habit. When she refused, he cut her up with the knife. Police say her body was covered in stab wounds. Her right eye had …