Woman was reported missing on Tuesday
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Judge said, 'You greatly damaged the dignity of the dead'
Partially decomposed body showed no signs of external wounds
Woman suffered a 5-centimeter-long gash on her forehead, police said
No money changed hands between the suspect and the girl, police said
Matter emerged after a customer tipped off police about the girl
Pair had been drinking together prior to the incident, police said
Suspect turned himself over to police on Wednesday
Suspect was dismissed in 2018
Suspect collected the pension of his mother for a period after she died, police said