It happened just after 1 a.m. Sunday, October 3 inside the Albany houses on Troy Avenue in Crown Heights.
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A ShotSpotter Siren was also activated.
Video shows the gunman approach 22-year-old Roshad Twells before pulling out a gun and opening fire.
Twells was found dead in front of the building.
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It's not clear what led up to the deadly violence.
Anyone with information in regard to the identity of this individual is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
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