This kinda heinous crime had happened before, I guess.
When I was kid, there used to live this family who immigrated from India. When the son in the family got married, within one year the daughter-in-law got died/killed.
Rumors had it that the daughter-in-law didn't bring enough dowry and there was always family dispute.
Rumors also had it that she was torched alive with kerosene. 

--it was sick to hear as a kid.