A 33-year-old NYC artist found dead at a posh Hamptons spa last year was savagely bludgeoned with a hammer before the killer — her boyfriend and benefactor — left a suicide note calling her “a real devil,” The Post has learned.

Newly released records obtained by The Post on the shocking murder of Sabina Khorramdel Rosas reveal her cause of death and the twisted texts that Thomas J. Gannon, 56, wrote hours after leaving her bloody body on the bed they shared.

Rosas’ death at Shou Sugi Ban House spa in Southampton on Oct. 28, 2024 shocked the wealthy community and New York art circles where Rosas was beloved. 4

Until now, Suffolk County Police had refused to give details of Rosas’ death, describing it only as “violent.”

It was extremely violent, records released this week under th

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