Accused Tarun Verma and Kavita were also slapped a fine of Rs 5,000 each by district and sessions court judge Suryaprakash Kankda on Friday for killing Sonika on July 11, 2014.
It was alleged that the duo were in a relationship owing to which they conspired to eliminate Sonika, additional public prosecutor B S Narnolia said.
A case was registered against them at Nihalganj police station in Dholpur, he added.
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