The twisted Staten Island teen accused of decapitating his mom’s boyfriend eerily stared, with an oddly calm expression on his face, as he pleaded not guilty to the gruesome murder Friday.

Damien Hurstel , 19, shuffled unbothered into a Richmond County courtroom, for the first time since he allegedly killed, beheaded and mutilated Anthony Casalaspro , 45, last week inside their shared West Brighton home.

“Yes,” Hurstel, his messy hair covering one eye, said as Judge Raymond Rodriguez asked if he was pleading not guilty to the murder charge — the only word he uttered during the hearing. 8

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Seven of his family members quietly sat in the courtroom as the gaunt teen walked in, clad in a rumpled orange jumpsuit and bearing a distant, strangely serene expression.

The apparently m

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