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Maria Sadaqat, the victim, was taken to Pakistan Institute of Medical Sciences (PIMS) reportedly after being tortured by the family of the would-be-groom who asked to marry her but was turned down, local media reported.
Though doctors previously described the woman's condition as stable and improving, on Wednesday she died from sustained injuries.
Sadaqat, a teacher at a private school, was admitted to hospital with 85 percent burns on Tuesday.
She was attacked by at least five people as she returned home from work, the police reported. The woman cried for help, but it took her neighbors a considerable amount of time to respond since her house is located in a remote area. By the time the help came, she had already suffered heavy injuries.
Sadaqat managed to identify two of the attackers, the police said, also adding that one of them worked together with the victim at school.
The police has launched an investigation against the five suspects. Three of them were taken in custody immediately after the incident, while others are currently being sought, Pakistan's SAMAA news channel reported.
The province's chief minister, Shahbaz Sharif, has obliged law enforcement authorities to draw up a preliminary investigation report on the case as soon as possible.
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