Nazimuddin Samad, 28, a masters student of the state-run Jagannath University's law department, was killed by suspected Islamist militants in Old Dhaka's Sutrapur area last night.
He had been on a hit list of 84 atheist bloggers that a group of radical Islamists prepared and sent to Bangladesh's interior ministry.
Samad was attacked by three assailants on a busy road while walking to his home in Gendaria with another youth after completing classes at the university near Bahadur Shah Park.
The youth accompanying the victim has been missing since the incident, a police official said. "They initially hacked him and then fired gunshots to confirm his death," he added.
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Samad, who hailed from Sylhet, was the information and research secretary of Sylhet district unit of Bangabandhu Jatiya Jubo Parishad. He was also an activist of Gonojagoron Moncho's Sylhet wing.
His friends said Samad used to campaign for secularism on Facebook and was critical of radical Islamists.
A day before the murder, he expressed concerns over the country's law and order in a Facebook post.
Businessmen in the area closed their shops immediately after hearing the gunshots. Police cordoned off the crime scene. They recovered a bullet shell from the spot.
Nurul Amin, assistant commissioner of Sutrapur division, was quoted as saying that police went to the spot and found the body in a pool of blood.
Nurul said it was clear that the assailants kept an eye on Samad's activities for long.
University Proctor Nur Mohammad said Samad got admitted to the university two months ago.
"We have informed his family about the murder and are taking detailed information about him," he said.
the past six months specially targeting minorities, secular bloggers and foreigners.
Last month, a 65-year-old Christian convert was hacked to death in the northern Bangladeshi town of Kurigram by three motorbike-borne unidentified assailants.
Last year, four prominent secular bloggers were killed with machetes, one inside his own home.
Bangladesh-born US blogger and science writer Avijit Roy, 42, was attacked just yards away from a book fair in Dhaka in February last year. A month later, fellow blogger Washiqur Rahman, 27, was hacked to death in broad daylight near his home in Dhaka.