A spokesman for Howard declined comment on Wednesday's meeting, saying the case remains active.
The GBI, meanwhile, has nearly finished its investigation of the shooting. The agency expects to send its findings to Howard next week, according to spokesman John Bankhead.
"The investigative report is under final review by GBI supervisors," Bankhead said.
The GBI took over the case the day after the Dec. 16 shooting at the request of Union City police.
Mawuli Mel Davis, the attorney for Waiters' family, has alleged police misconduct in the hours following the shooting, saying witnesses were either intimidated or ignored.
Union City police have denied the charges but otherwise declined comment.
Davis said Howard reassured the family he has been keeping tabs on the case since the onset. The district attorney did not address the alleged misconduct by Union City police, said Davis, adding he expects to receive the district attorney's report in about a month.