By AFP and Chris Summers
A Pakistani man used a kitchen knife to murder his sister after flying into a rage when he caught her using a mobile phone.
Hayat Khan, 20, attacked his 16-year-old sister Sumaira at their home in the Orangi Town neighbourhood of Karachi in Late April.
Senior police officer Azfar Mahesar said the brother later threw her out of the house where she lay on the steps as neighbours gathered to help.
A woman using a mobile phone, in particular to speak to a male non-relative, is seen as highly taboo among conservative elements in Pakistani society.
Speaking to AFP from his jail cell, Khan said: 'She was talking to someone at the entrance of the house, I asked her who was there and she replied why are you bothered it's none of your business, I am free to talk to anyone.
'I just wanted to scare her off with the knife but it hurt her fatally.'
He added: 'Of course it is very sad, I wish I could also die.'
Mobile phone footage shot by an unknown onlooker showed several men and boys standing around Sumaira, who was seen dressed in a red tunic and orange headscarf and draped in a blanket as she writhed in pain.
A young boy is shown fighting back tears as one man says in Pashto: 'Let's take her to a hospital in a car.'
Another man replies: 'It's almost here, it's coming brother.'
Abdul Hakeem, a local resident, said: 'She was taken by car to a private hospital but she died before she arrived.'
Mr Mahesar told AFP the police had taken the unusual step of making themselves the complainants in the case, in order to avoid a loophole in the law that allows the relatives of the victim to forgive the killer.
He said: 'We have registered the case on behalf of the state as we don't want to give the family the option of settling the case outside court.'
The move came after Sumaira's father Inayat Khan told reporters: 'What is done is done' and said he forgave his son.
Hundreds of women are murdered by their relatives in Pakistan each year on the pretext of defending family 'honour'.
A Girl in the River: The Price of Forgiveness, which tells the story of a survivor of an attempted 'honour killing', won the Oscar for best documentary short earlier this year.
Pakistan amended its criminal code in 2005 to prevent men who kill female relatives escaping punishment by pardoning themselves as an 'heir' of the victim.
But it is left to a judge's discretion to decide whether to impose a prison sentence when other relatives of the victim forgive the killer, a loophole which critics say is often exploited.
Prime Minister Nawaz Sharif has vowed to eradicate the 'evil' of honour killings but no legislation has been tabled.