Footage of a close-circuit camera shows three suspected killers of wife of Superintendent of Police (SP) Babul Akter fled by a motorcycle after accomplishing their mission.
The CCTV was installed a few hundred yards off the spot.
The footage shows the deceased Mahmuda Akter Mita walking along with her son near GEC intersection in Chittagong city.
One of the suspected killers is seen walking past a lamppost apparently communicating with his accomplices over mobile phone.
At one point of following Mita, who was seen wearing hijab, from other side of the road, the suspect crosses the road and starts to run towards her.
Set up quite at a far distance, the CCTV failed to film the killing clearly. After the murder, the suspected killers are seen speeding away on a motorbike.
Closely watched, the footage also shows some terrified pedestrians who watch the event at safe distance.