Police early Thursday arrested Winij Akkarasuwankul, 53, director of Ban Nong Kla School in Moo 7 village in Tambon Khao Wiset. He is charged with killing Ladda Jindakaew, 33.
Police believe the schoolmaster had had an intimate relationship with the victim.
Ladda had taken her son to play football at the school on Monday afternoon and was later found strangled to death in the restroom. She’d also sustained head injuries.
The murder left teachers and students terrified.
Police said a CCTV surveillance camera recorded Winij and Ladda in what appeared to be a close relationship. Winij’s mobile phone showed that he contacted the woman often.
Police are seeking court permission to detain the director while the investigation continues.