Main suspects are warlords and security forces - Times Online
(1) ISI (Inter-Services Intelligence) - see above for explanations of motive.
(2) Baitullanl Mehsud - Al-Qaeda tied Warlord is the lawless region. Repeatedly threatened her, despising her for being secular, a reformer, as to westernized and for being a women.
(3) Haji Omar - The leader of the Pakistani Taliban. Ditto for Mehsid.
(4) Al Qaeda and Osama Bin Laden - Ditto for Mehsud and Omar.
(5) Musharraf - Saw her as a political rival and someone who could remove him from power. Although the article states he is an unlikely culprit.
(6) Pakistani Army independent from Musharraf - They would lose money and power, which is more than enough motive.
(7) Saudi Arabia - Saw her as way to secular and too westernized in a very important Arab/Muslim Country!