Karachi: Investigations are underway regarding mysterious death of actress Humaira Asghar.According to investigating authorities keys of Humaira Asghar flat have been taken into custody. 3 keys of central gate of flat have been found inside flat.Building administration, chowkidar and former house maid of actress are included in investigation.As per media report investigating authorities have said investigation has been made from building administration, chowkidar and house maid. All these people remained in contact with Humaira Asghar till October 2024. House maid of Humaira had quit the job in 2024.