A middle-aged man from Udon Thani hung himself after he beat his wife and two daughters to death with a stick because he was in serious debt.
Police and rescue volunteers were called to the family home in the Phen district of the northeastern province at 6.30am on Sunday after being alerted by neighbours.
The body of Thaisan Sonchai, 50, was found hanging from a mango tree in the front garden of the house.
Inside on the ground floor the bodies of his wife Watcharaporn, 50, and their two daughters Kachaporn, 23, and Sasithorn, 19, were found dead laid beside a tray of flowers, candles and incense sticks.
All three had serious head injuries with investigators believing they were killed with a large wooden stick that was laid close by.
A forensic doctor said all three had been dead for at least six hours.
Thaisan left a suicide note saying he was heavily in debt and unable to support his family. He also apologised to all concerned for the trouble he had caused.
His father-in-law told police Thaisan owed around 2 million baht in total that he had borrowed to finance his daughters’ education