The deceased was identified as Khokon of Barguna district.
Tipped off that a group of robbers were preparing to commit robbery, a team of DB police conducted a drive in the area, said Ikhtiar Uddin, inspector of DB police.
Sensing presence of the law enforcer, the robbers opened fire on police, forcing them to fire back in self-defence, he said.
At one stage, Khokon was caught in the line of fire and suffered bullet injury.
Later, he was taken to Cumilla Medical College Hospital where doctors declared him dead.
One pipe-gun, two cartridges and a sharp weapon were recovered from the spot.