Dennis had allegedly taken off.
He was captured by CNN security personnel in the parking deck across the street from the Omni, police said.
Investigators found a handgun and two spent shell casings in his hotel room.
He faces two counts each of aggravated assault and possession of a weapon during the commission of a felony.
The victims were taken to Grady Memorial Hospital and are in stable condition, police said.
In other news:
The Kings of the South are the Kings of MLS. Atlanta United defeated Portland 2-0 to win the MLS Cup. The crowd was whipped into a frenzy early by owner Arthur Blank. Josef Martinez scored his 35th goal this season, extending his MLS scoring record. He was named MLS Cup MVP in addition to already being MLS MVP.