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The Kolkata court sentenced Sanjay Roy, a former Kolkata Police civic volunteer, to imprisonment till death after he was convicted of the rape and murder of an on-duty doctor at the state-run RG Kar Medical College and Hospital. The Kerala court, on the other hand, handed the death penalty to 24-year-old S.S. Greeshma for poisoning her boyfriend.

India's West Bengal state launched an appeal on Tuesday to overturn a life sentence in favour of the death penalty for a police volunteer convicted of the rape and murder of a junior doctor, a senior lawyer aware of the development said.

The police had sought the death penalty in a horrific but familiar crime. Its handling by the local authorities had outraged the nation.

Earlier today, the Bengal government also appealed to the high court, seeking death for sole convict Sanjay Roy.

Protests erupted in West Bengal last August after the body of a trainee doctor was found with multiple injuries in a hospital lecture hall.

Sanjay Roy was held guilty under Sections 66 (rape), 64 (causing injury resulting in death) and 103 (1) (murder) of the Bharatiya Nyaya Sanhita.

The Central Bureau of Investigation (CBI) will file an appeal before the Calcutta High Court (HC), seeking death sentence for Sanjoy Roy, who was sentenced to "life imprisonment until death" by a Sealdah court in the Kolkata rape-murder case,

Chief Minister Mamata Banerjee-led West Bengal government had filed a plea challenging the life imprisonment sentence handed to Sanjay Roy, sole accused in RG Kar rape-murder case.