"We have found out that he was a member of Ansarullah Bangla Team and one of the six extremists for whom we earlier announced a bounty of Taka 500,000 (USD 6374)," a senior police officer said.
He said the militant was killed in a pre-dawn encounter in Dhaka and was named in a police list as Shariful or Sharif, but he previously used several other names like Sakib alias Saleh alias Arif alias Hadi-1.
The militant was also believed to have been directly involved in the subsequent killing of another blogger Niladri.
The identification of the alleged militant came hours after police said a "miscreant" was killed in a shootout with police detectives in the capital's Khilgaon area.
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Sharif was a firearm and ICT trainer and key-recruiter of ABT, which along with Jamaatul Mujahiedeen Bangladesh (JMB), is blamed for a series of fatal attacks on secular or liberal activists and religious minorities, according to a post on the website of Dhaka Metropolitan Police.
The 17-year-old, identified as Golam Faizullah Fahim, was killed in the surprise shootout a day after police secured a court order to interrogate Fahim in custody in connection with the murder attempt on Ripan Chakraborty, 50, a mathematics lecturer of a government university college in Madaripur.
Bangladesh in recent months witnessed a series of deadly clandestine attacks on religious minorities and secular and liberal activists.
But Fahim, a student of a college in Dhaka, was the lone assailant to be grabbed by people in the neighbourhood though two other attackers fled the scene while Chakraborty survived the assassination attempt sustaining critical head injury.