An investigation is underway after a man shot to death in the Bronx on Monday.
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…