NEW DELHI: The Delhi Commission for Women ( DCW ) on Monday issued a notice to Tihar jail authorities over the delay in the execution of convicts of Nirbhaya murder case.This is the second time that the DCW has issued a notice to the Tihar authorities over the delay. The commission had last year also questioned the delay in the imposition of death penalty to the Nirbhaya case convicts.The Supreme Court (SC) had in July upheld the verdict of death for the four Nirbhaya gangrape and murder convicts. An SC bench comprising Chief Justice Dipak Misra and justices R Banumathi and Ashok Bhushan had rejected the pleas of three of the four convicts Mukesh (29), Pawan Gupta (22) and Vinay Sharma (23).At the time, in its ruling upholding the death sentence, the Supreme Court had said that the "brutal, barbaric and diabolic nature" of the crime could create a "tsunami of shock" to destroy a civilised society.One of the accused in the case, Ram Singh, had allegedly committed suicide in the Tihar Jail here. A juvenile, who was among the accused, was convicted by a juvenile justice board. He was released from a reformation home after serving a three-year term.Nirbhaya was gang-raped on the intervening night of December 16-17, 2012, inside a running bus in South Delhi by six persons and severely assaulted before being thrown out on the road. She succumbed to her injuries on December 29, 2012, in Singapore.