Mullah Akhtar Mohammad Mansour (Pashto: اختر محمد منصور Akhtar Muḥammad Manṣūr; born probably 1968, although possibly 1963 or '65 was possibly, Naib Imam) and was the Emir (leader) of the Taliban under the name IEA (Islamic Emirate of Afghanistan), an Islamic fundamentalist political movement in Afghanistan. He was successor of Mullah Muhammad Omar (however his succession remained a dispute in itself).
On 21 May 2016, it was reported by a U.S. defence department official that Mansour had been killed in a US drone strike in Pakistan. The official, who was not sanctioned to speak publicly about the attack, said Mansour was believed killed when the drone hit a vehicle in which he and another militant were riding. The second person was also killed by the strike, which was approved by U.S. President Barack Obama.
The claim of his death has been acknowledged by one of the senior Afghan Taliban commanders (according to various trusted sources) and by the Afghan intelligence agency. His body is at a morgue in Pakistan (picture shown below):
The airstrike targeted a white car allegedly carrying the HVT (high value target) in Pakistani territory. Soon after the conduction of the raid; puppet governments of Afghanistan and Pakistan were informed about the events.
Additional info:
Mullah Mansour Akhtar had a Pakistani passport under the name of Wali Muhammad
Pictures of aftermath of the air-raid: