NEW YORK (CBSNewYork) — A Manhattan doctor was found dead in his apartment, and it’s believed that heroin is to blame.

A pulmonologist at the NYU Langone Medical Center, Dr. Ravindra Rajmane hadn’t been seen for days.

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When someone stopped by his Kips Bay apartment on Park Avenue South, Tuesday morning, they discovered the 50-year-old doctor lying on his bed, dead from an apparent heroin overdose.

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Drug paraphernalia was scattered about as were several glassine envelopes stamped with the words ‘knock out king.’

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The medical examiner’s office will perform an autopsy to determine the cause of death.