The police are probing the role of a man who was purportedly seen taking a selfie with Sidhu Moose Wala a short while before his death.
A CCTV video shows a group of men around a black SUV. A few then walk around to the driver's side of the vehicle and take pictures.
Sidhu Moose Wala had been driving a black SUV on the day he was shot dead in Punjab's Mansa city.
The police say that one of the men, after taking the selfie, called the shooters to alert them. Reports say the police are considering two of the men seen on the video as suspects.
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Moose Wala was shot dead on May 29, a day after his security had been curtailed by the state government.