Sector Commander Lt Col (retd) Abu Osman Chowdhury passed away at a Dhaka hospital on Saturday morning.
He breathed his last at the Combined Military Hospital, Dhaka, said his personal assistant Abul Bashar.
Abu Osman Chowdhury served as the commander of Sector-8 of the Mukti Bahini during the War of Liberation in 1971.
In 1971, Abu Osman Chowdhury was posted in Chuadanga as a Major of the Pakistan army and the Commander of 4th Wing East Pakistan Rifles (EPR).
He left for Kushtia with his family on March 23, 1971 to attend an official meeting. He was staying at Kushtia Circuit House on the night of 25–26 March when the news of Operation Searchlight reached him.
Sensing imminent danger, he left Kushtia on early morning of March 26 and headed to Chuadanga via Jhenaidah while local political workers have already revolted.
Later, Bangalee soldiers raised the flag of Bangladesh at EPR 4 Wing Headquarters in Chuadanga which was later reinforced, led by Major Chowdhury, with police and Ansar personnel and local youths.
In the first sector commander's conference in July, Major Abu Osman Chowdhury was appointed the commander of the western sector, which comprised of Kushtia, Jashore, areas of Faridpur, including Doulatpur-Satkhira Road encompassed within Khulna.