- Vikram Chatterjee was earlier charged with rash and negligent driving
- Forensic tests on the car put the driving speed between 95 to 105 kmph
- Sonika Chauhan was killed in the car crash on April 29
The police decided to apply stricter charges against Mr Chatterjee after investigation of his car's speed at the time of the crash, CCTV footage from the nightclubs he had visited with Ms Chauhan on the night of 28 April and the statements of nightclub personnel and the model-anchor's friends who were there.
Around 3:30 am April 29, Mr Chatterjee was apparently driving Ms Chauhan home when the car crashed. Forensic tests on the car have reportedly put the speed at the time of the crash at between 95 to 105 kmph.
Ms Chauhan was rushed to hospital where she died around one hour later.
Supporters of both have launched campaigns in Kolkata. A "Justice for Sonika" petition has been launched by activist Pranadhika Sinha and "Voice for Vikram" has been started by the actor's friends.