The CBI is likely to file the appeal against the Sealdah court order by Friday with detailed arguments in favour of capital punishment, they said.

The trail court had sought death penalty for Sanjay Roy but was turned down by the trail court, where Additional District and Sessions Judge Anirban Das said that the crime did not fall under the ‘rarest of the rare’ category.

Sentencing Roy to life in prison, a Kolkata court said Monday that the case didn’t meet the criteria to be classified as ‘rarest of rare’, and therefore, did not merit death penalty.

The West Bengal government has already approached the high court, challenging the verdict and seeking death penalty for Sanjay Roy.

The Central Bureau of Investigation (CBI) will seek the death penalty for Sanjay Roy, the convict in the RG Kar rape and murder case. According to sources, the application may be filed in the Calcutta High Court within the next two days.

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,

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 Bengal government has moved a division bench to file an appeal for the death penalty for the convict, Sanjay Roy, in the RG Kar rape-murder case.