Sana Cheema, a 25-year-old woman of Pakistani origin who had Italian citizenship, died on April 18 in the city of Gujrat in eastern Punjab province.
Kamran is now in Pakistan and police officials say he will also be interrogated. "If it determines the cause of death is due to murder, only then will police charge the suspects", said Mudassar Sajjad.
If confirmed, her case will be the second recently publicized honor killing in Punjab where the father and the ex-husband of a British-Pakistani woman, Samia Shahid, were charged in 2016 over her rape and murder.
"The body of Cheema was exhumed in the presence of a woman judge and samples have been sent for forensic text in Lahore", Kunja police station official Waqar Ahmad told PTI. The family termed her death an "accident".
According to the police, the girl's father, identified as Ghulam Mustafa, wanted to marry her off to his relative but Sana wanted to get married in Italy.
Because of the rejection Sana Cheema refused to eat, fell ill and died, relatives told police.
The death was reported earlier this week by a local Italian newspaper, Giornale di Brescia, amid conflicting reports that attributed her killing to refusing an arranged marriage or a sudden illness 10 days earlier.
However, the woman's father, brother and paternal uncle have been nominated in the FIR of her murder. On the issue, the Italian foreign ministry remarked that it has kept an eye on the case, adding that it is determined to reach to the bottom of the case.
Sana wanted to marry an Italian man and had turned down multiple proposals from within her family. The DPO, taking notice of the news on social media, registered a case against the accused.
According to the Human Rights Commission of Pakistan, as many as 50 honour killing cases have been recorded in the country till April 1 this year, while 460 such killings came to light in 2017.
Social media users speculated over the possibilities of the woman being killed in the name of "honour".