Border Security Force of India (BSF) killed Bangladeshi cowboy by hurling cocktail at Lalmonirhat border early Tuesday.Members of BSF also brought the dead body to their custody.The dead man is Hazrat Ali, 35, son of Amir Hosen, of Danga village under Dohogram union in the district.According to source, BSF hurled cocktail on Hazrat when he was going to bring cattle at Lalmonirhat border.Lieutenant Colonel Ahmed Bazlur Rahman, Commander of Bangladesh Border Guard-15 confirmed the matter to the reporters.