Samia Shahid, a resident of Dhok Pandori village, some 230 km from Lahore, had come to Pakistan from Dubai on July 15 to see her ailing father and was found dead on July 20.
Her father had claimed she died of cardiac arrest.
The murder would have gone unnoticed had British MP Naz Shah not wrote a letter to Prime Minister Nawaz Sharif, alerting him that it could be a case of "honour killing".
Bakhsh has told Dawn newspaper that "the forensic report of the sample of her body has confirmed rape and the DNA report of her former husband matched the sperms."
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Samia's former husband Shakil and her father Chaudhry Shahid are in police custody for her alleged murder.
Police sources have said Shakil - also Samia's cousin - confessed to strangling her to death as she married another man of her choice.
Samia's murder came over a week after social media celebrity Qandeel Baloch was strangled by her brother "for disgracing" their family honour. The incident sparked international uproar over increasing "honour killing" cases in Pakistan, forcing the government to announce introducing strict legislation against those involved in the case.
Kazim has told police that her wife was killed by her family members for marrying against the will of her parents.
Kazim and Samia, both British-Pakistani dual citizens, had been married for two years and were living in Dubai.