Centre has commuted the death sentence of Balwant Singh Rajoana, who was convicted in the assassination of former Punjab CM Beant Singh in 1995. Rajoana will now undergo life term. Beant Singh was killed when a 'human bomb' Dilwar Singh blew himself up outside the CM's office. Rajoana was the alternative 'human bomb' in the plot to kill the CM. a total of 16 people were killed in the attack. Congress has hit out at the Centre saying commuting Rajaona's death sentence is a black day in the history of Punjab.