Rajagopala Nagar police have arrested four people for murdering a 37-year-old businessman.
The victim was having an illicit affair with the woman, the daughter-in-law of an inflential man in the area.
One person surrendered before police after killing a man for having an illicit affair with his wife.
The victim's note said the woman was aware that he was married but nonetheless was continuously after him, demanding to have sexual relations with him.
The incident happened in Sattijore village of Nawabganj block in Bahraich district on the intervening night of last Monday and Tuesday.
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According to locals, the couple had frequent bouts of quarrel over the wife's illicit affair with a person of the same village.