Gulista Begum killed herself in the Nala village area following a dispute with her mother-in-law yesterday, they said.
She had suffered severe burn injuries when she was rushed to a nearby hospital, where doctors declared her brought dead, the police said.
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In another incident, Sushil Kumar Kashyap (22) allegedly committed suicide by consuming poison in Rampuri village in Muzaffarnagar district yesterday, they said.
According to officials, he was rushed to a district hospital, where doctors declared him dead.
The motive behind his suicide is not immediately known, they said.