A member of parliament from
Witnesses said Saleh al-Hindi was shot dead on Friday, along with two bodyguards, when armed men sprayed his car with bullets before escaping.
Reuters news agency reported al-Hindi's son was also killed in the attack.
The mountainous Saada province has been the scene of a rebellion by members of the Zaidi community, a branch of Shia Islam, that has left thousands of people dead since 2004.
While it was not clear who was behind the attack, al-Hindi was known to have supported government efforts to subdue the rebels and had survived several previous assassination attempts.
The rebels reject the rule of Ali Abdullah Saleh,
Their movement, known as al-Huthein after the late commander Hussein Badr Eddin al-Huthi, aims to restore the Zaidi imamate that was overthrown in 1962.
Saleh has led
Reconciliation halt
The parliamentarian's death comes as a government reconciliation body called on Friday for al-Huthein rebels to withdraw from a number of armed positions.
In a statement issued from the Yemeni capital Sanaa, the commission said its members would return to Saada for the implementation of a Qatar-backed reconciliation agreement only once rebels withdrew.
The government body also accused the rebels of "procrastination tactics" - a charge al-Huthein negotiators deny.
PHOTO CAPTION
Yemeni lawmaker Saleh al-Hindi is seen in an undated handout photo released by the Yemeni Parliament.
Al-Jazeera