A university teacher was stabbed to death in northern Bangladesh by unidentified assailants on Saturday, police said.
The attack on English professor Rezaul Karim Siddique, 58, occurred in the city of Rajshahi, officer Sushanta Chandra Roy said.
The motive for the crime was unclear, and no one has claimed responsibility.
Police suspect Islamist militants who had claimed killings of secularist bloggers in the past years may be involved in the latest assault due to similarities between the attacks.
Chief of Rajshahi Metropolitan Police Mohammad Shamsuddin said the assailants used sharp weapons and attacked from the behind the neck, a method used by suspected Islamists to kill Bangladeshi bloggers and publishers in 2014 and 2015.
Witnesses said two youths had arrived by motorbike and left the scene after the professor was killed, according to Shamsuddin.
Several hundred students and teachers from Rajshahi University protested the murder, blocking a major highway that links the northern city with the Bangladeshi capital Dhaka.
Protestors called on the government to immediately bring the killers to justice.
Siddique's colleagues said he performed diverse cultural activities in Rajshahi, but was not involved in any political party.
In November 2014, a sociology teacher at the same university was killed in a similar attack claimed by a local Islamist group.
Five secularist bloggers and one publisher have been killed by suspected Islamist militants in Bangladesh since last year.