A Muslim Jordanian man stabbed to death his pregnant sister because she married an Egyptian man against the family's wishes.

Investigators arriving at the scene Tuesday said the suspect told them "he killed his sibling to cleanse the family's honor using a kitchen knife," the Jordan Times reported.

The unidentified woman was eight months pregnant when she was killed with 25 stab wounds to different parts of her body, the paper said.

Her death is the fifth "honor killing" in Jordan this year tallied by the Times, which counted 17 last year.

An initial investigation into Tuesday's killing revealed the victim married an Egyptian man one year ago and left for Egypt, but she returned home last week to give birth.

After killing his sister in the family home, the brother called the police and waited for them to come and arrest him.

As WorldNetDaily reported, last September two sisters were hacked to death by their Muslim brothers in Jordan in an "honor killing" that came one day after the country's parliament rejected a bill imposing tougher sentences for the crime.

That same month, a Muslim Kurdish refugee living in the UK was sentenced to life in prison for murdering his 16-year-old daughter because she had started a relationship with a Lebanese Christian boy and had become too "westernized."

An anthropologist's study last year said dozens and probably hundreds of brutal "honor killings" of Palestinian women and girls – most of whom are virtually blameless – annually go unreported.

James Emery says the women "are murdered in their homes, in open fields, and occasionally in public, sometimes before crowds of cheering onlookers."

Related stories:

Muslim slays daughter in 'honor killing'

Sisters axed in Muslim 'honor killing'

Palestinian women, girls killed for family 'honor'