- NYPD Officer Ronald Kennedy responded to report of July 7 stabbing in Harlem
- Victim, a 29-year-old male, suffered serious stab wound to his upper torso
- Kennedy used empty bag of potato chips and tape to temporarily seal wound
- NYPD says Harlem Hospital physician credited Kennedy with saving man's life
- Department released body cam footage of the incident on Friday afternoon
- New York City has experienced resurgence in crime in recent months
- Latest figures show nearly 5% increase in number of murders so far this year
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