Bizarre new details emerged Sunday in the murder of a man in a ritzy Long Island City apartment building — with him found dead sitting upright in a bathtub and cops taking a naked man into custody.

Cops responded to the luxury Hayden high-rise building in Queens just before 1 p.m. Saturday after security responded to a fire alarm on the roof and spotted a naked man using a fire extinguisher to douse surveillance cameras and then trying to bust into an apartment there, law-enforcement sources said.

The NYPD put the man in cuffs and checked on the apartment he tried to get into, sources said.

Inside, they made a grisly discovery: blood splattered…

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