Cameras caught the gunfire as it erupted on 135th street and Liberty Avenue last month in the Richmond Hill section.
A 35-year-old man was killed.
One suspect tried to rob the victim in a Ford SUV.
A good samararitan witnessed the robbery, and tried to help.
The second suspect then runs over, and both men started to fire at the good samaritan.
The first gunman then shot and killed the driver in the SUV.
Both men are believed to be about 25 years old.
