Indian Defence Forum

Though not sure the number of times he has been reportedly killed.

TIFWIW.
As per twitter, mullah omar has died.

This article dated 29th July, 2015 says its been more than 2 years ago he died of tuberculosis.
http://www.usatoday.com/story/news/world/2015/07/29/taliban-leader-mullah-omar/30819359/

Reuters says that a press conference has been called by Afghanistan govt on this issue