I am family of that woman and I know what exactly happened: she wanted to get married but another man was already in love with her

I am family of that woman and I know what exactly happened: she wanted to get married but another man was already in love with her, so then that man was threatening her and everything she had told this to her parents and the police. but the very day she died she saw the man. he said: I am going to burn you alive. so when the man came into the flat and put her on fire. a woman in the flat heard her shouting for help she saw that she was in the fire....