Ramallah, Sept. 3 -- Hundreds of Palestinian women held a demonstration in the West Bank on Monday to demand an investigation into the death of a 21-year-old woman who many suspect was the victim of a so-called honor killing.

Israa Ghrayeb, a makeup artist from a village near Bethlehem, died last month after being hospitalized with severe injuries. Friends and women's rights activists suspect her male relatives assaulted her over a video shared online that purportedly showed her out with a man who had proposed to her.

The family says she jumped from a balcony of their home after being "possessed by demons."

In conservative parts of the Middle East, women have been murdered by male relatives over suspicions they violated strict rules on...