The Neo-Jamayetul Mujahideen Bangladesh militant, who has not been identified, killed himself right before a raid by police counterterrorism unit and SWAT on a hotel in Dhaka's Panthapath, Inspector General of Police Shahidul Hoque was quoted as saying by Dhaka Tribune.
The militant had planned to attack processions to Bangabandhu Memorial Museum on the National Mourning Day, police said.
The police have also found leaflets containing militancy propaganda among the deceased's belongings, the report said.
The raid was part of an intensified crackdown on militants following the last year's Dhaka cafe attack in which 22 people, mostly foreigners and an Indian girl, were killed.