This disturbing article published in 2010 comments on a study of honor killings in the Muslim world. The statistics are beyond shocking.
Most honor killings are not classified as such, are rarely prosecuted, or when prosecuted in the Muslim world, result in relatively light sentences.
Worldwide, female victims aged 25 years and younger were killed by their families of origin 81 percent of the time. In North America, 94 percent were killed by their family of origin; this figure was 77 percent in Europe and 82 percent in the Muslim world. In North America, fathers had a hands-on role in 100 percent of the cases when the daughter was eighteen-years-old or younger.
It is clear that Muslim girls and women are killed for behaving in accepted Western or modern ways when they express a desire to attend college, have careers, live independent lives, have non-Muslim friends (including boyfriends with whom they may or may not be sexually involved), choose their own husbands, refuse to marry their first cousins, or want to leave an abusive husband.
Worldwide Trends in Honor Killings
Lots more in the article.