The incident took place in Toba Tek Singh district when the suspect visited the residence of the victim with his marriage proposal, according to the girl's family members.
The proposal was turned down by the girl and it enraged the suspect who lit her on fire after sprinkling petrol on her, the family members were quoted as saying by Dawn.
The girl was shifted to a local hospital in critical condition where she succumbed to her wounds during treatment.
The victim's family-members staged protests demanding justice for the deceased.
The suspect was warned several times in the past for eve-teasing the victim, they said.
The residents of that area said that the suspect also had an altercation with the victim's brother, a day earlier, over harassment issues.