Unidentified assailants shot dead an activist of United People's Democratic Front (UPDF) at Marakoyla in the district's Ramgarh upazila yesterday.
The dead is Gopal Chakma alias Tapan, 38, from Dujoripara of Manikchhari upazila.
Police said locals saw some four to six armed criminals around 12:00 noon open fire on Gopal at a tea stall in Marakoyla, killing him on the spot.
Shahjahan Hossain, assistant superintendent of police (Ramgarh circle), confirmed the incident.
Police sent the body to Khagrachhari Adhunik Sadar Hospital morgue for an autopsy.
Meanwhile, Pradipan Khisha, coordinator of Khagrachhari district unit UPDF, in a press release blamed the armed cadres of Santu Larma faction of Parbattya Chattagram Jana Sanghati Samity (PCJSS) for the killing.
He condemned the killing and demanded immediate arrest of the killers.
However, Sajib Chakma, central assistant press and information secretary of the PCJSS Santu Larma faction, denied the allegation.