Kolkata/IBNS: Dr. Sandip Ghosh, the former principal of Kolkata's RG Kar Medical College and Hospital where 31-year-old trainee doctor was raped and murdered, used to sell unclaimed dead bodies, claimed his ex-colleague.

Former RG Kar Hospital deputy superintendent, Akhtar Ali, said Dr. Ghosh removed all evidence of selling dead bodies.

"He is a criminal, not a doctor. He's ruined many students' lives.... He runs a mafia raj. He has ruined many lives, taught students to consume alcohol and he even sold unclaimed dead bodies and tampered with death records and removed the registers so that nobody comes to know about it," Ali told Times Now.

The former staffer said he had spoken about the illegal activities but no one acted even after Dr. Ghosh was found guilty in the probe.

Dr. Ghosh, who came under massive fire from the protesters who went into an indefinite strike demanding justice, was summoned for the sixth consecutive day after the Central Bureau of Investigation took charge of the case.

Dr. Ghosh, who faced the ire for alleged mismanagement and financial irregularities at RG Kar Medical College and Hospital, resigned from his post facing protests from the medical students.

Though he had resigned, the Mamata Banerjee government had controversially appointed him to a similar post at Calcutta National Medical College within a few hours.

The trainee doctor was allegedly raped and murdered at the seminar hall of RG Kar Medical College and Hospital, which is located in North Kolkata's Belgachia area.

One person, a civic volunteer, has been arrested in connection with the case but protesting students as well as the victim's parents suspect more people are involved in the case.