ISI killed Mullah Obaidullah by torture.

[Niazi]

It's ultimate reward for biegn ISI stooge

http://taand.com/index.php?mod=article&cat=c66&article=35050

[Afghanistan2010]

That is true...he was killed by the enemies of Allah and his beloved Messenger.

[KGODB]

Why did they do this?

[Friend]

This is what isi do with their friends. I tell you never ever trust isi guy even if he is your father or your brother. Agency's men are the most untrustworthy guys you will find in humankind.

[torkham]

friend, you cannot trust any secret service agent, what they opine of you is a secret you'll never know. let alone ISI.

[Afghanistan2010]

He was a prisoner not a friend of them....the agency will be target of the new campaign of the taliban.

Maybe they wanted to know whereabouts of the amir and fellow leaders of the islamic emirate,and Mullah Obaidullah and Mullah Bradar will never utter a single word,rather they meet death.