Husband of the woman said he killed his first wife . Pakistani Prime Minister orders full report on the killing . Baby Khan , 3 months pregnant , was stoned Tuesday in a public square of a big city . Her father , brothers and cousins died in the attack .
Husband of slain woman says he killed his first wife . Pakistani Prime Minister orders full report on the killing . Farzana Parveen , 3 months pregnant , was stoned Tuesday in a public area of a big city . Her father , brothers and cousins participated in the stoning .