My Husband Death Case

I got married last year Nov, 2019. Recently I lost my husband. He was expired on May 2020. it was a mysterious death. But, his family members told me that it was a natural death. And that day onwards his family ignore me completely. I don't know how he has died. As a wife I want to know his death mystery. Yet now we didn't get the forensic reports. Just we received a postmartam report. In that, he was injured badly on head and scull. And got blood colt. We don't know the cause of death. We are waiting for a forensic report. His family didn't bother about me. No calls and No msgs. At the time of marriage they told 4 acres of land property. He is the only son And one daughter. She got married and two kids. My parents gave dowry 11lakhs and 12 tulas gold to his family. Yet now they didn't respond to my calls and msgs. Even his sister also ignore me. What's my future. I don't know. Finally, I and my family decided to give a complaint about that family. Please give a suggestion, how can I proceed.