The broadcast of a young man hanging his 11-month-old daughter and then himself live on Facebook, following a quarrel with his wife, has drawn grave concerns from health authorities over the possibility of copycat killings.
The video clip, which went online on Monday night, has sparked fears it will spur people suffering from anxiety and other mental health issues to commit similar acts, especially as suicide rates in Thailand are on the rise, according to the Mental Health Department.
The latest deaths were reported in Phuket, where the 21-year-old man, identified as Wutthisan Wongthale, killed his daughter and committed suicide on the third floor of a deserted building in Thalang district, according to police.
Investigators believe Wutthisan felt "awfully hurt" after a quarrel with his spouse, perhaps spurred by jealousy.
About 7pm on Monday, police in Thalang were informed that a video clip broadcast on Facebook showed a man hanging a child and then himself.
The four-minute clip featured a horrific scream coming from the girl.
Authorities were led to a deserted building in tambon Sakhu, where they found the man and the child hanging 10 metres from the floor.
An elder brother of Wutthisan's wife, who identified himself only as Suksan, told police that Wuthisan had worked for a firm in Thalang district.
"The husband probably felt jealous" after thinking his wife was romantically interested in someone else, Phuket governor Noraphat Plotthong said.
Mr Noraphat asked people not to share the video clip to avoid causing more trauma to the victim's family.
Chiranut Trairat, the baby's mother, said she hopes the tragic incident will make other parents aware of the risk of violence in relationships, and how to contain it.
Dr Boonruang Triruangworawat, chief of the Mental Health Department, said sharing the clip can send a bad message to people, especially children and those who are undergoing serious problems and may think of committing suicide. He urged people not to share it.
They may conclude that suicide is "acceptable" because the clip has drawn so many viewers, he said.
Even just watching the clip can cause unpleasant thoughts and trauma, the department chief said.
Suicide rates have been on a worrying upwards trend in recent years.
In 2015, the average number of suicides stood at 350 people a month, or "one person committed suicide every two hours", Dr Boonruang said, referring to statistics compiled by the Khon Kaen Rajanagarindra Psychiatric Hospital.
Men are four times more likely to kill themselves compared with women and are also more likely to injure someone else in the process, the hospital said.
Relationship issues, particularly jealousy, are one of the main causes of suicide in Thailand, followed by depression, according to the hospital's findings.
The Public Health Ministry has set a target to curb suicides to a rate of less than 6 per 100,000 people, from 6.47 per 100,000 currently, by 2021, Dr Boonruang said.