Anum Ishaq masih, in her late teens and from a Christian family, was murdered while she slept in Sialkot in the early hours of Sunday.
"Saqib Ishaq masih, 23, killed his sister by smashing her head with a wooden log while she was sleeping," Rana Zulfiqar, the officer in-charge of the police station in Sialkot told AFP.
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"The girl, named Anum Ishaq masih, was in her late teens and wanted to marry a Christian neighbour but the family was against the marriage," he said.
Rana said the girl was insisting on Saturday that she would marry the man, infuriating her sibling.
The brother has since been arrested and charged with murder after the girl's father filed a case against him.
Shamoon Gill, a Christian activist, told AFP that honour killings were very rare among the Christian community in Pakistan.
"It has nothing to do with religion but is part of a social issue that is deeply rooted in the eastern societies," he said.
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"Most of the Christians and even Hindus are converts. They have converted but there are still some elements of tribal society."
Last week sixteen year-old Zeenat Bibi was set on fire in Lahore by her mother for marrying a man of her own choice. Bibi's mother later confessed to the crime.
A couple were also murdered in Lahore last week for marrying without their family's consent.
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