Arsala Rahmani, a former minister in the Taliban regime, was a "key negotiator" in the council established by Karzai to hold peace talks with Taliban insurgents, the official said.
"Shortly after leaving home he was hit by a single bullet from a passing car. The bullet passed through his left arm and hit his heart," Rahmani's grandson Mohammad Waris told AFP.
"He died in the hospital."
Rahmani "had recently established contacts with senior Taliban leaders," a senior security official told AFP, requesting anonymity because he was not authorised to speak to the media.
Rahmani, who was the Taliban's higher education minister during their rule from 1996 to 2001, left the Islamic militia and joined Karzai's government after the US invaded Afghanistan in the wake of the 9/11 attacks by al Qaeda on US cities.
His death is seen as a major blow to Karzai's US-backed peace efforts.
The former head of the council, ex-president Burhanuddin Rabbani, was killed last September by a purported Taliban suicide bomber posing as a peace envoy.
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It is the work of the those who donot want peace in Afghanistan. But such assasinations could not deter Afghan peace process. It is obvious that all those who are annoyed by peace in Afghanistan as well as on strategic cooperation with the US, have committed this hienous crime.
the assasinations of key figures will continue in the future as Pakistan, Afghan Taliban, USA and karzai are not the sole representators to solve Afghan problem..there are many others who see the game slipping off their hands..
US is an unmitigated disaster in Afganistan. They need to focus more deeply on exit strategy.