The victim was identified as Ashok Ratanlal Shah (50).
As he collected the cash of Rs 7 to 8 lakh and stepped out of his shop at the day's end, the assailants approached and pushed him inside.
One of them pulled out a revolver and fired at him from point blank range, while the other two snatched the bag containing the cash.
The three escaped on a motorbike, leaving an injured Shah on the road.
Shah was taken to hospital by two others who were with him where he died during the treatment.