He said more search warrants have been served, more physical evidence has been recovered, and more witnesses have been identified, but gave no specifics about any of those.
Doering said there are likely even more witnesses who haven't come forward, and investigators will be looking for them.
A gun recovered Tuesday was found in a pond in a gated subdivision behind Brunswick Floors on U.S. Highway 17, just more than two miles from the shootings, Doering said. Investigators are working to see if that was the gun used in the killing. Doering said investigators will look into whether the gun was used in other crimes, which is routine.
Investigators were tipped off to the location of the gun after investigating Karimah Elkins and her 33-year-old sister Katrina Elkins. Police arrested and charged the two women with lying to police about who was with DeMarquise the morning Santiago was killed.
According to an arrest warrant, Karimah Elkins told officers she was with her son between 8 and 11 a.m. on Goodyear Avenue when she was actually being detained at the Glynn County Detention Center at that time. She was released around 10:30 a.m.
According to Katrina Elkins' arrest warrant, she told officers she was with her nephew between 8 a.m. and 3 p.m. on P Street, which is contrary to De'Marquise's statement that he was at another location during that time.
Gough said at a news conference earlier on Wednesday he believes the indictment came too soon.
"While I have the utmost respect for District Attorney Jackie Johnson and her very capable staff, as well as Chief Doering, (Brunswick Police) Chief (Tobe) Green, and the various law enforcement agencies that have participated in this investigation, we are deeply disappointed and troubled that this case was rushed before the grand jury prematurely," Gough said. "Time will tell, but we are confident that numerous witnesses have yet to be interviewed, that examinations and test results remain pending."
Doering on Wednesday still refused to answer the key question, whether West and the suspects know each other, saying it would harm the investigation. He would not say how long the suspects have known each other.
Lang's family has said Lang did not know Elkins.
Doering closed the news conference saying, "We have and will continue to get the truth, and that truth will come to light at the proper time."