He was taken to Chittagong Medical College Hospital first, then to a local private hospital and finally to Dhaka Medical College Hospital after his condition kept deteriorating.

He succumbed to his wounds on the way to Enam Medical College Hospital.

Mamun, from Jalial village in Noakhali's Binodpur, was fatally shot on the Mohakhali flyover while heading back to his home from his aunt's residence in Shaheenbag, Dhaka.