Surveillance video released by the NYPD Sunday shows the chilling moment a killer sat down next to a hard-working GrubHub deliveryman in a Manhattan park before stabbing him to death and stealing his e-bike.

Surveillance video released by the NYPD Sunday shows the chilling moment a killer sat down next to a hard-working GrubHub deliveryman in a Manhattan park before stabbing him to death and stealing his e-bike.