The alleged leader of the brutal and widely-publicized Delhi gang rape that killed 23-year-old Jyoti Singh Pandey was found dead in in his cell on Monday morning, but his family isn’t buying the official story. Ram Singh, who drove the bus on which Pandey was attacked, appeared to hang himself with his own clothes, even though he was already on suicide watch. If that were true, Singh would have had to evade the guards assigned to him and hang himself in front of this two cellmates. Those suspicious circumstances have led his family to question the report and call for an investigation, which the Delhi government will conduct.

According to reports in The Times of India and elsewhere, Singh’s father believes that either guards or other inmates might have a hand in his death. “Singh’s father, Mangelal Singh, told Sky News his son had been raped in prison by other inmates and had been repeatedly threatened by inmates and guards. He said his son gave no hint of any despair that could drive him to take his own life when he visited him in jail four days ago,” reported Sky News.

Despite his father’s account, Singh and the four other adult men (one of the accused is being tried as a minor) were placed under suicide watch this past January, CNN-IBN Live reports. According to that report, being placed under suicide watch doesn’t necessarily mean that Singh was placed under solitary confinement, nor does it mean Singh was being constantly observed. However, CNN-IBN’s sources say that he shared his cell with two other inmates, and there were no CCTV cameras outside Singh’s cell, meaning the other two inmates might be the only witnesses to his suicide.

More: India Gang Rape Suspect Dies in Jail, but Was It Suicide or Murder? - Alexander Abad-Santos - the Atlantic Wire