Hasan Zafar Arif, 73, who took over the leadership of the Pakistan chapter of the MQM London last year in Pakistan at a time when the a was banned by the government, was found dead on Sunday on the back seat of his car near the Ibrahim Hyderi area.
His family said there were blood stains on Arif's face and shirt when his body was found.
Arif, took over the leadership in Karachi last year following the authorities decision to ban the party from activities in the wake of its chief Altaf Hussain's anti-state speech outside the Karachi Press Club.
Senior Superintendent Police, Rao Anwar said chemical tests were still being conducted after an autopsy on Arifs body.
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