LONDON (AP) — The girl was murdered by her Pakistani parents for her Western ways. And it was her little sister who bravely told jurors how her mother and father suffocated the 17-year-old with a plastic bag — gripping testimony that led to her parents’ murder conviction on Friday.

Justice Roderick Evans sentenced Iftikhar, 52, and Farzana Ahmed, 49, to life in prison for killing their daughter, Shafilea, in 2003. The couple — first cousins from the Pakistani village of Uttam — were ordered to serve a minimum of 25 years in prison.

In Britain, more than 25 women have been killed in so-called “honor killings” in the past decade. Families have sometimes lashed out at their children on the belief that they have brought their household shame by becoming too westernized or by refusing a marriage.

Shafilea was only 10 when she began to rebel against her parents’ strict rules, according to prosecutor Andrew Edis.

The young girl would hide make-up, false nails and western clothes at school, changing into conservative clothes before her parents picked her up.

But it was the last year of her life that proved to be the most traumatic.

During the trial that began in May, jurors heard from Shafilea’s younger sister, Alesha, who said she witnessed the murder when she was 12.

After an argument about Shafilea’s dress, her parents pushed her down on a couch, stuffed a thin white plastic bag into her mouth and held their hands over her mouth and nose until she died, Alesha testified.