After searching near the bank of the lake for more than two hours, the search was called off to allow dive team operators to warm themselves, according to Richmond County sheriff's Sgt. Richard Roundtree.
Sheriff's authorities are basing their search on information learned during their investigation of Mr. Lee's death, Sgt. Roundtree said.
"As the investigation continued, we had credible evidence that the weapon was tossed in here once the body was discovered," Sgt. Roundtree said.
Mr. Lee's body was found near the Fifth Street bridge in North Augusta last week.
Investigators have charged Javell Leverett Gordon, 21, with murder and possession of a firearm during the commission of a crime in the case, but are still searching for 18-year-old Victor Levee Scott.
Sgt. Roundtree said police believe Mr. Lee was killed in Augusta and his body was later dumped in North Augusta.
"We feel it was a drug deal gone bad," he said.
Police have visited Mr. Scott's home in Burke County and believe he is in the Augusta area.
They are offering a cash reward for information leading to his arrest. Anyone with information is asked to contact the sheriff's office at (706) 821-1080.
Reach Adam Folk at (706) 823-3339 or firstname.lastname@example.org.
Richmond County investigators and the Augusta-Richmond County Dive team plan to return to the lake once the weather warms next week to continue searching for the weapon, according to Sgt. Richard Roundtree.