[1] He also held the special responsibility of overall supervision of Bangladesh Army personnel sent as part of the United Nations Peacekeeping Force during the war in Somalia.

[1][13] Dalim, along with a few other officers of Bangladesh Army including Major Syed Faruque Rahman and Khandaker Abdur Rashid, planned a coup which took place on 15 August 1975.

[14] He took control of Bangladesh Betar Radio station and made an announcement stating, "I am Major Dalim speaking; autocrat Sheikh Mujib has been killed.

The new president declared martial law and passed the 1975 Indemnity Act which provided legal protection to those involved in the coup.

[21][22][23] Shariful Haque Dalim had been in hiding for an extended period due to his controversial role in Bangladesh's political history, particularly his involvement in the 1975 military coup that resulted in the assassination of Sheikh Mujibur Rahman.

Convicted in absentia for his role in the coup, he faced legal and political challenges during Sheikh Hasina's rule, which made his return to public life difficult.

[24][25] Following the fall of Sheikh Hasina's regime and the political upheaval in Bangladesh in August 2024, Dalim resurfaced publicly on 5 January 2025, in a live interview on the YouTube channel of expatriate journalist Elias Hossain.

In the interview, Dalim spoke about his life in hiding, contemporary political issues, and his perspective on his role in shaping Bangladeshi history.