Multiple outlets report the victim was working an off-duty job.
Police departments regularly have officers in uniform while working and being paid by private companies. From the NYPD Paid Detail Unit (PDU): "All Paid Detail police officers are considered off-duty, acting as private contractors... All officers will report in full uniform to the location designated by the vendor for check-in and assignment."
https://www.nyc.gov/html/nypd/downloads/pdf/public_information/nypd-258_paid_details_2016-06-16.pdf
Thanks for the information. The article was careful not to say it was a private gig, though given the circumstances what else could it be.
Armed or not armed?
Sounds like a bad idea. I would be opposed to this. They should only be wearing an uniform while on duty.