Here's a short story:

(CNN) -- A close aide to Pakistan's Taliban chief Baitullah Mehsud said he is breaking ties with him and confirmed reports that Mehsud was behind the assassination of former Prime Minister Benazir Bhutto. 

Former Pakistan Prime Minister Benazir Bhutto was assassinated in December 2007 at a campaign rally. 

Qari Turkestan Bhitaini, a self-proclaimed right-hand man of Mehsud, said Mehsud was behind the December 27, 2007, assassination of Bhutto, Pakistan's Express TV reported. 

Bhitaini said he is breaking ties with Mehsud because he blames the Taliban chief for killing scores of innocent Muslims in recent attacks in Lahore. 

The Pakistani government and CIA officials have said in the past that Mehsud was responsible for Bhutto's death. 

Bhutto, 54, was heading the opposition to then-President Pervez Musharraf when she was assassinated during a campaign rally in Rawalpindi ahead of parliamentary elections. 

The Pakistani government, who has struggled to control terrorism, is waging a military offensive against the Taliban in the country's North West Frontier Province. 

 (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: who is a close aide to Pakistan's Taliban chief
Guess: Qari Turkestan Bhitaini

Question: who is  Pakistan's Taliban chief
Guess: Baitullah Mehsud

Question: Baitullah Mehsud said he is breaking ties with who?
Guess: unknown

Question: why is he breaking ties?
Guess: Killing scores of innocent muslims

Question: Former Pakistan Prime Minister Benazir Bhutto was assassinated in
Guess: December 2007

Question: where was he killed
Guess: a campaign rally.

Now answer the following question in the same format.

Question: Qari Turkestan Bhitaini, a self-proclaimed right-hand man of who?

Mehsud