A former policeman died as he jumped off the rooftop of a three-storey building after hacking three people, including his son, at Banchanagar in Lakshmipur municipality on Monday morning.

The deceased was identified as Nasir Ahmed, 55, hailing from Faridganj upazila in Chandpur district.

The injured were identified as victim’s son Imran, 21, and neighbours Mizanur Rahman, son of Golam Rahman, and Nasir Ahmed, son of Abdul Mannan.

Nasir went into retirement in August last year after serving as a constable at the Traffic Department of Bangladesh Police in Chandraganj Police Station of Lakshmipur.

Police and locals said Nasir, along with his wife and two sons, has been living at a house at Banchanagar for the past seven years.

After his retirement, he reportedly developed some mental health issues. Recently, his wife went to their village home with their other son, leaving Nasir alone at home with his college-going son Imran.

On Monday morning, Nasir allegedly attacked Imran with a machete, leaving him seriously injured.

As the injured son tried to escape from the house, Nasir chased him. Witnessing the scene, neighbours tried to resist him, said Hossain Mohammad Raihan Kazemi, additional superintendent of Lakshmipur police.

However, Nasir hacked them too, leaving Mizanur and Nasir injured.

At one point, he went up to the roof of the three-storey building and jumped from there.

On information, police took Nasir to Lakshmipur Sadar Hospital, where he was declared dead.

The other injured were also taken to hospital. Two of them were later sent to Dhaka for better treatment.