Samia Shahid, 28, was found dead on July 20 at her parents' house in Mangla area of Jhelum district in Punjab province.
"Chaudhry Shakil, the first husband of Samia, has confessed to have strangled her on July 20. He said he had a grudge against her for marrying a man of other sect," said a police official involved in the investigation.
He said police are also investigating the role of Samia's parents for abetment to murder.
Chaudhry Shahid, Samia's father, earlier had claimed that she died of cardiac arrest and later changed his statement to claim that she had committed suicide.
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"He (Shakil) has been arrested along with the father of the murdered woman and further legal proceeding will be worked out," another police official said.
Samia, a resident of Dhok Pandori village, some 230 km from Lahore, had come to Pakistan from Dubai in mid July to see her ailing father and was allegedly murdered on July 20.
Syed Mukhtar Kazim, second husband of Samia, told police that his wife had been killed by her family members for marrying against the will of her parents.
"My wife converted to Shia -- my sect -- before wedding which had irked her parents," Kazim had said, calling upon the UK and Pakistani governments to ensure justice is done.
According to the autopsy report, Samia had marks on her neck, suggesting that she had been strangled.
Kazim and Samia, both British-Pakistani dual citizens, had been married for two years and were living in Dubai.
A beauty therapist from Bradford, Samia had previously been married to her first cousin Shakil but the couple parted ways after divorce in May 2014. She then married Kazim of Taxila in September 2014 and both started living in Dubai.
"She told me by phone that her father was all right and now she was getting threats to her life. On July 20, my wife's phone was switched off and on contacting Mobeen, her cousin, he told me that Samia had suffered a heart attack and died," Kazim said.
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