A court in Karnataka has awarded death sentence to a serial killer, who's also known as 'Cyanide Mohan', for raping and murdering a woman at Bengaluru's Kempegowda bus station in 2005. Mohan, who was arrested around 10 years ago, has been convicted in 17 murder cases. He used to rape women and kill them with 'contraceptive' pills laced with cyanide.