Delhi rape: Ram Singh's body released after post mortem 12 March 2013 Last updated at 12:36 The body of an Indian man charged over the gang rape and murder of a Delhi student has been handed to his family after a post-mortem examination. Ram Singh was found dead in his shared cell at Tihar jail on Monday. Prison officials say they believe he hanged himself. Defence lawyers and his family allege he was murdered. Mr Singh was one of five men being held in the case, which outraged India. India's home minister Sushil Kumar Shinde said the death was a major lapse in prison security. An investigation is under way. Murdered Mr Singh's body was released to his family at the All India Institute of Medical Sciences (AIIMS) on Tuesday afternoon after his post-mortem. The results have not been released. His body was loaded onto an ambulance and taken away by the family, reports said. My brother was murdered. I have seen injury marks on the body and finger marks on the throat," the Press Trust of India quoted his brother as saying. Mr Singh's death has come as a huge embarrassment for the authorities who are already under enormous pressure over the case. Tihar jail officials said Ram Singh appeared to have hanged himself with an improvised rope made from a blanket at about 05:00 local time on Monday (23:30 GMT Sunday) while his three cellmates were asleep. Jail spokesman Sunil Gupta said Mr Singh had not been on suicide watch. They accused face 13 charges, including murder, gang rape, kidnapping and destruction of evidence. The 23-year-old rape victim, who has not been named for legal reasons, was with a male friend when she was attacked on a bus and thrown from the vehicle on 16 December.