Additional Sessions Judge PVP Lalitha Siva Jyothi awarded the sentence to Kondapaka Sridhar (30), Akuleni Indira (26), Kondapaka Sujatha (29), Guduri Raju (24) and Konda Raju (21), after finding them guilty in the case.
The court also imposed a fine of Rs 17,000 each on the convicts.
Another accused, Merugu Chiranjivi (25), died during the trial, said Additional Public Prosecutor Vengaldas Srinivas.
The six were accused of abducting and killing Gadadasu Srinivas (42), a resident of Sircilla, in June, 2011.
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The police had tracked down Kondapaka Sridhar, a resident of Mancherial district, and the other convicts with the help of their mobile call details.
The convicts had killed Srinivas as they did not receive the ransom and kept his body in a refrigerator in a flat in the Uppal area of Hyderabad.
The convicts were tried in court for abduction, murder, criminal conspiracy and destruction of evidence under the Indian Penal Code.
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