Pakistan, Aug. 3 -- Investigators probing the death of former IBA student and aspiring businessman Mir Raza Ali Khan say several pieces of evidence point toward a possible suicide, but key forensic inconsistencies and the disappearance of the weapon continue to leave critical questions unanswered.

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The 25-year-old's body, bearing a gunshot wound to the chest, was discovered in bushes near Shahi Qila in Karachi's Gulistan-i-Jauhar area, two days after he was reported missing from his home in PECHS.

According to investigators, Raza returned to his office after arriving home, collected a pistol and later left his house after leaving behind his car and house keys, his watch and cash...