1) post mortem would be done by police to find exact cause of death of your cousin

2) based on report police will charge her husband with murder

3) further police will scrutinise call records of her husband on date of incident

4) her husband will be confronted with the call records which shows that he was very much present at the scene of crime

5) you will not be given his call history .

6) the charge sheet filed by police after completion of investigations would contain all the evidence to nail the culprit

The evidence that is collected by police during investigation is filed along with the chargesheet in the court. It does not show that evidence to anybody, more so it cannot be sought even under the provisions of RTI. Wait till the filing of the chargesheet. If there is delay in the filing of chargesheet or the chargesheet reveals shoddy investigation then you may move the High Court for appropriate directions.

Since the case is still under investigation you can ask for any of its report. It is purely confidential and you are not supposed to know.

However if you have anu doubt or lack of faith on the present investigation you can apply for investigation to be done by CID, CRIME BRANCH OR CB.

Officially or legally you cannot get the call history from police or cyber cell even if you know that they are very much available with them.

Even you cannot file any petition before court to extract the desired details either from the service provider or from police since the matter is under investigation by police.

You can try to get the details through some unofficial sources by some malpractice only.