The shooting happened in front of 413 East 187th St. in the Belmont section just before 7 p.m.
Surveillance video shows a gunman walking along 187th Street towards the victim, a 21-year-old man, who was standing on the sidewalk before he was shot in the head.
The victim was taken to St. Barnabas Hospital, where he was pronounced dead.
He has not yet been identified.
No arrests have been made so far, and the investigation is ongoing.
----------
* More Bronx news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Download our connected TV app