A female teacher turned herself in to police at midnight on Sunday after she allegedly strangled her tomboy partner in a fit of jealousy, police said on Monday.
After her surrender, police took Chanpen Chartkulwanit, 30, to re-enact her alleged killing of partner Chanasnon Thongbamrung, 25, in Chiang Mai.
Chanpen told police she was a teacher for temporary hire in Mae Hong Son. She travelled to Chiang Mai on Sunday to take an exam to become a public school teacher and stayed with her long-time partner, Chanasnon.
But she quarrelled with Chanasnon out of suspicion that her partner had a relationship with another woman.
During the quarrel at 10pm, she jumped on Chanasnon and used her hands to strangle her. She said she did not initially know her partner had died when she stopped struggling.
When Chanpen realised that Chanasnon had died, she left the house to consult a friend and turned herself in at midnight.