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A Level 2 sex offender pleaded guilty to third-degree criminal mischief and faces up to four years in prison as a second-felony offender, Erie County District Attorney Frank A. Sedita III announced Thursday.

David Masse, 31, of Hamburg, caused substantial damage to the house of a neighbor on April 1 while the residents were home – on the premise that Masse believed his neighbor was a robot, officials said. Masse had been previously convicted of attempted sexual abuse, Sedita said. Masse will be sentenced at 9:30 a.m. Aug. 28.