OP Singh used to be one of the most trusted aides of Chhota Rajan, until the don learnt that Singh was trying to poach his men. Infuriated, Rajan ordered his right-hand man, DK Rao, to kill Singh. Illustration/Ravi Jadhav

Nearly 15 years after gangster Omprakash Singh was killed in one of the boldest and most well-planned jail murders that the state has ever witnessed, the case has come to an end with not a single conviction.