While officials initially claimed that Tariq Mehboob, Anjuman Naujwanan-i-Islam (ANI) chief and member of Sunni Ittehad Council, died of heart attack, his family suspects foul play and alleges that he was tortured.
A Rangers spokesman, however, denied that Mehboob was in their custody when he died and claimed that he was in Central Jail in Karachi.
Mehboob was arrested by Rangers five days back from his residence with five other people for allegedly providing refuge to target killers which is punishable under the Anti-Terrorism Act 1997.
However, a statement issued by the Rangers said he was sent for 90 days Preventive Detention by ATC in Central Jail on April 16 after completing all legal formalities for further investigation.
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It claimed that he did not die in Rangers' custody and that he died in Central Jail in Karachi.
The cause of his death was yet to be confirmed by authorities.
Muttahida Qaumi Movement (MQM) has demanded the formation of a judicial commission to probe the death of Mehboob.