Toni Brown, 42, responded with a supervisor to a 911 call for someone in cardiac arrest at Madison Avenue near 135th Street at about 5 a.m. on Oct. 2, according to prosecutors.
Her supervisor noticed a prescription bottle containing about 20 Oxycodone pills with the name of the person suffering the heart attack on them.
The supervisor later saw that the bottle only had about 11 pills remaining. She confronted Brown about it and the EMT handed over a latex glove containing nine Oxycodone capsules, according to the criminal complaint.
The person suffering the heart attack died at her home and the supervisor reported Brown to police, who arrested her at about 11:28 a.m.
Brown was charged with petit larceny, criminal possession of a controlled substance and criminal possession of stolen property.
She worked through Mt. Sinai Hospital and not the FDNY, officials said, and has been barred from accessing the 911 system to prevent her from responding to calls.
"We are cooperating with the authorities as they conduct their investigation of the allegations," a spokeswoman for the hospital system said in an email. "The employee is suspended until further notice."
Brown was arraigned in Manhattan Criminal Court on Sunday and released without bail.
Her lawyer did not respond to a request for comment and she is due back to court on Nov. 9.