Police said Farzana Parveen, resident of Nanakana Sahib- some 80 kms from here, had married 45-year-old Mohammad Iqbal, who hailed from the same area, a few months ago against the wishes of her family.
The incident occurred as the couple reached the court premises to record Farzana's statement to defend her husband against allegations by her family that he kidnapped her and forced her to marry him.
After failing in their attempt, nearly 20 members of her family, including her father and brothers, attacked the couple with sticks and bricks before a crowd of onlookers in front of the court, said police official Naseem Butt.
"Farzana died on the spot after suffering critical head wounds while Iqbal managed to escape the attack," Lahore police spokesman Niyab Haider told PTI.
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Farzana was three-months pregnant.
"We contracted court marriage as the family of Farzana was not happy," Iqbal told police, adding since their marriage, Farzana's family members had been continuously threating them.
Farzana's father Muhammad Azeem was arrested but her brothers fled.
"We are raiding the whereabouts of the accused to arrest them earliest," Haider said.
Around 900 women were killed in Pakistan last year by their families in honour killings, according to Human Rights Commission of Pakistan, a private organisation.