They said 48-year-old Manzurul Islam Liton was shot at his village home as he was holding a meeting with local activists.
He was rushed to a hospital in critical condition at neighbouring Rangpur district where doctors declared him dead.
"He (Liton) was brought here (Rangpur Medical College Hospital) with wounds but he possibly died somewhere on his way to the hospital," acting director of the facility Dr Ajay Kumar Roy said.
Police said unidentified miscreants on motorbikes shot Liton from a close proximity at his village home at Masterpara near Bamondanga railway station.
He said the miscreants fled the scene using the motorbike.
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