"We want to make an impact on the people's senses through our peaceful protest and thereby we want to put an end to all such killings in the country," he said.

Reza Kibria was addressing a protest programme arranged as part of the "Blue for Peace" movement initiated by Asma Kibria, widow of slain Kibria, in front of the former minister's Dhanmondi house in the capital.

Expressing dissatisfaction at the government's "failure" to try the real killers of the Awami League leader, Reza Kibria said, "He [Kibria] will never return to us, but the arrest and trial of the killers will definitely bring mental peace for us."

"People should register strong protest against such killings," he observed.

Four sisters of Kibria -- Safia Rahman, Fouzia Shahed, Ashrafi Siddique and Sharifa Mosabbir -- took part in the programme. Earlier, they formed a human chain and brought out a procession, which paraded the Dhanmondi area.

Wearing blue dresses, people from all walks of life including Awami League (AL) leaders Asim Kumar Ukil and Ajoy Kar Khokon joined the programme, expressing their solidarity with the demand for trial of the killers.

Kibria and four AL activists were killed in a grenade attack at a public rally on January 27 at Baidderbazar in Habiganj.