First what was the cause of death and how it happened should be determined. A statement made by interested party , specially wife , after several days with the help of lawyer can also may not be 100% correct. So what happened and how such an incident ended in a death should be ascertained.
The allegation that police asked for liquor and refusal of that started this should first be investigated to find the truth. If that is correct there cannot be a call to emergency police line about the disturbance in the night.(all emergency calls are recorded so it is easy to ascertain)
Next thing is how many people were injured and what were the injuries and how it happened. Normally when a Police arrive even drunken people obey them without a resistance.
The media cannot try a case in Sri Lanka, it is up to the courts to decide on the evidence in impartial way