Baghaichhari police station OC Amir Hossain said that on Wednesday Muk Chakma (32) was killed in his home in Bonglatali Union at about 10 pm Eid al-Azhar.
Five people were killed in Rangamati after the murder of seven people, including the district president of UPDF (Prasit Khista), supported by the city of Khagrachari.
The CHT Jana Sanghati Samity (Mnellama) blamed the UPDF for the killings.
OC Amir Hossain said, according to the initial available information, the killed Chakma worked as the source of the Chittagong Hill Tracts Jana Sanghati Samity (MNLARMA) and those who killed him are the forces of the United Peoples Democratic Front (UPDF)
The next step will be taken after the decision of the victim's family, OC said.
Baghaichhari Upazila President Suresh Kanti Chakma told bdnews24.com that their laborer was murdered under the leadership of UDDF Uday Bikash Chakma, Chittagong Hill Tracts Jana Sanghati Samity (MNLARMA).
"Initially, the mission was hit hard by a stick, and after they were shot they fled."
UDF spokesperson Niran Chakma told bdnews24.com: "We have no involvement in this incident, which could be their internal conflict."
On Saturday (August 18) six people, including the district chairman of the hill school council supported by UPDF (Prashant khesa), shot dead in the opposition party on the city of Chagrachari. Three others were injured.
In the afternoon the procession was again attacked in the Pirachara area of the city. One died there.