Atlanta police homicide Detective Vincent Velazquez spoke about the investigation Thursday. Authorities also see a potential connection to a fourth victim.
Velazquez said there is a person of interest who is very comfortable in the neighborhood but would not release further details.
The first victim was 56-year-old Alfred Glass, a self-employed contractor who was shot to death in August 1998, as he worked in his garage.
Police have connected two other subsequent murders those of Dennis McGuire in 2007 and Warren Williams Jr. in 2008 with the same gun.
Velazquez said a fourth victim, Joseph Williamson, may also have been murdered by the same person in 2007.