A rebellious teenager was killed by her Pakistani parents, a court in England found Friday. Iftikhar and Farzana Ahmed were sentenced to 25 years in prison for the 2003 murder, in which the couple used a plastic bag to suffocate their 17-year-old daughter, Shafilea. Authorities got a break in the case when the couple’s other daughter gave information on her parents. The girl was only 10 years old, prosecutors said, when she began to push back against her parents’ rule, causing her mother to abuse her. The investigation was one of hundreds conducted by British law enforcement officials into instances of forced marriage in the country.