The accused Parav Murmu, who was not sound mentally, has hammered his wife on the head in her sleep around 1 am today, Deputy Superintendent of Police (Musaboni), Ajit Kumar Vimal said.
Murmu's wife died instantly, he said adding that a police team rushed to the village and arrested the culprit.
The body has been sent for post-mortem in M G M Hospital here.
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