BURI RAM: A man has allegedly confessed to killing a man who had only recently left the monkhood, after catching him having sex with his married aunt in the bathroom.

Sanguan Damthong, 46, who was until recently a monk, was hacked and stabbed to death in the bathroom of a house in Muang district on Saturday night.

His body was found on Sunday morning.

Police said the dead man had been attacked with a large knife, suffering a long, deep cut to his head and more wounds to his shoulders, left arm and torso. The bathroom was splattered with blood.

The owners of the house, Mr Liam and Mrs Od (surname not released), were taken in for questioning.

The couple initially denied knowing anything about the murder. After several hours they said Sanguan was killed by their nephew, Sithisak Suraram, 44, who lived next door.

Mr Sithisak was allegedly confessed to killing Sanguan, telling police the former monk had been having an affair with his aunt. About 7pm on Saturday, Sanguan and Mrs Od went into the bathroom and made love. He grabbed a knife, broke into the bathroom and slashed and stabbed Sanguan to death.

Mr Sithisak was charged with premeditated murder.