A 45-year-old New York City Sanitation Department worker was brutally killed and decapitated inside a Staten Island home on Monday in what NYPD police describe as a shocking domestic attack involving his girlfriend’s teenage son.

Police rushed to a residence on Cary Avenue in West Brighton shortly after 4:20 p.m. following a distressing 911 call reporting a stabbing. Upon arrival, officers found the 45-year-old victim dead in the bathroom, his head severed from his body. A knife was still lodged in his neck, according to police sources.

What do we know about the case?

The victim’s girlfriend’s 19-year-old son, who reportedly has a long history of mental health problems, was arrested at the scene but had not been formally charged as of Monday night.

Sources said the teen’s younger siste

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