CHENNAI: Police have nabbed the prime accused in the murder investigation of TCS employee Uma Maheshwari, 23. Uma’s body was found on February 22. A joint team of CB-CID and Kancheepuram police arrested Ujjal Mandal from a train near Kolkata.  A police officer said Ujjal dragged Uma Maheswari into some bushes where the three men sexually assaulted her before stabbing her to death.