Mr Benjamin Mbiti Kalili was a telecommunications expert who had been seconded by United Nations to the Arusha based International Criminal Tribunal on Rwanda genocide which was trying the genocide suspects to help in tracking Mr Kabuga.
According to his family, Mr Kalili was killed just a month after a botched operation to capture the Rwanda genocide suspect in Nairobi, in which he is said to have been actively involved.
His younger brother, Francis Kalili, on Saturday told the Sunday Nation that the family still believes that hunting Mr Kabuga, who was captured on Saturday in Paris France, was a risky assignment which may have cost the engineer his life.
The younger Kalili, a lawyer practising in Kitui town, narrated how his elder brother was involved in the Tribunal's efforts to capture Mr Kabuga and how in May 2003, they almost succeeded in arresting him.
"After that botched operation, he came home before returning to Kigali and he expressed his frustrations at some rogue Kenyan police officers who he claimed had tipped off Mr Kabuga," Kalili's younger brother narrated.