The 37-year-old's killer, Natthawut Tammajanta, was on Wednesday sentenced to up to 23 years and four months in jail after pleading guilty to her murder.
The pair, both originally from Thailand, met while working at the Siam Kingdom restaurant in the Sydney suburb of Newington and started a relationship.
But after an argument on December 18, 2022, Tammajanta assaulted Ms Khantharat at their home in Albion Park Rail, south of Wollongong, so severely that he killed her.
The attack included choking and striking her repeatedly to the face and body.
In her sentencing remarks, Justice Natalie Adams said police who arrived at the scene observed Tammajanta's hands to be lacerated and swollen from his repeated assaults on Ms Khantharat.
"At one stage, the deceased had locked herself in the bathroom to escape the assault, but the offender was able to break down the door to continue his attack," she told the NSW Supreme Court.
Tammajanta described himself as a "jealous person" who felt insecure in the relationship and was suspicious that his partner was dishonest or too close with other men.
"The deceased was killed in her own home by an intimate partner," Justice Adams said.
"The dominant feature of the relatively short relationship was the offender's intense irrational jealousy and his desire to control the deceased's behaviour."
Tammajanta was given a non-parole period of 16 years and four months.
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