The case is mentioned in this article:
https://en.wikipedia.org/wiki/Honour_killing_in_Pakistan#Specific_occurrences
On 27 May 2014 a pregnant woman was stoned to death by her own family in front
of a Pakistani High Court for marrying the man she loved. Police investigator
Mujahid quoted the father as saying: "I killed my daughter as she had insulted all
of our family by marrying a man without our consent, and I have no regret over
it."
1990 Qisas and Diyat Ordinance
Most honor killings are encompassed by the 1990 Qisas and Diyat Ordinance, which
permits the individual and his or her family to retain control over a crime, in-
cluding the right to determine whether to report the crime, prosecute the offend,
or demand diyat (or compensation). This allows serious crimes such as honor kill-
ings to become "privatized" and to escape state scrutiny, shifting responsibility
from the state to the individual.
Under Islamic Sharia law, the punishment for murder, homicide or infliction of
injury can either be in the form of qisas (equal punishment for the crime com-
mitted) or diyat (monetary compensation payable to the victims or their legal
heirs). These concepts are applied in different ways in different Islamic systems.
In Pakistan, the right to waive qisas, or punishment, is given to family of the
victim. If and when the case reaches a court of law, the victim's family may
'pardon' the murderer (who may well be one of them), or be pressured to accept
diyat (financial compensation). The murderer then goes free. Courts have used
provisions like this to circumvent penalties for honor killings.
Once such a pardon has been secured, the state has no further writ on the matter
although often the killers are relatives of the victim. Human rights agencies in
Pakistan have repeatedly emphasized that women falling prey to karo-kari were
usually those wanting to marry of their own will. In many cases, the victims held
properties that the male members of their families did not wish to lose if the
women chose to marry outside the family. More often than not, the karo-kari murder
relates to inheritance problems, feud-settling, or to get rid of the wife, for in-
stance in order to remarry.
https://en.wikipedia.org/wiki/Honour_killing_in_Pakistan
Causes
There are multiple causes for which honor killings occur, and numerous factors
interact with each other.
Views on women
Honor killings are often a result of strongly patriarchal views on women, and
the position of women in society. In these traditional male dominated societies
women are dependent first on their father and then on their husband, whom they are
expected to obey. Women are viewed as property and not as individuals with their
own agency. As such, they must submit to male authority figures in the family –
failure to do so can result in extreme violence as punishment. Violence is seen as
a way of ensuring compliance and preventing rebellion.
Cultures of honor and shame
The concept of family honor is extremely important in many communities. The fam-
ily is viewed as the main source of honor and the community highly values the re-
lationship between honor and the family. Acts by family members which may be con-
sidered inappropriate are seen as bringing shame to the family in the eyes of the
community. Such acts often include female behaviors that are related to sex out-
side marriage or way of dressing, but may also include male homosexuality (like
the emo killings in Iraq). The family loses face in the community, and may be
shunned by relatives. The only way the shame can be erased is through a killing.
Laws
Legal frameworks can encourage honor killings. Such laws include on one side
leniency towards such killings, and on the other side criminalization of various
behaviors, such as extramarital sex, 'indecent' dressing in public places, or
homosexual sexual acts, with these laws acting as a way of reassuring perpetrators
of honor killings that people engaging in these behaviors deserve punishment.
https://en.wikipedia.org/wiki/Honor_killing#Causes
Religion
Widney Brown, the advocacy director of Human Rights Watch, said that the prac-
tice "goes across cultures and across religions". Human rights advocates have com-
pared "honor killing" to "crimes of passion" in Latin America (which are sometimes
treated extremely leniently) and also to the killing of women for lack of dowry
in India. Honor crimes occur in societies where there is an interplay between dis-
criminatory traditions of justice and statutory law. In some countries, this dis-
crimination is exacerbated by the inclusion of Shari'a, Islamic law, or the con-
cept of zina (sex outside of marriage).
Tahira Shaid Khan, a professor of women's issues at Aga Khan University, notes
that there is nothing in the Qur'an that permits or sanctions honor killings.
Khan instead blames it on attitudes (across different classes, ethnic and reli-
gious groups) that view women as property with no rights of their own as the mo-
tivation for honor killings. Khan also argues that this view results in violence
against women and their being turned "into a commodity which can be exchanged,
bought and sold".
https://en.wikipedia.org/wiki/Honor_killing#Religion