Atlanta police on Wednesday made an arrest in a double stabbing that left a couple dead in their Sweet Auburn apartment complex last month.

Investigators announced that 21-year-old Stefhon Hamilton was taken into custody along Northside Circle in northwest Atlanta. He was charged with two counts of felony murder.

On Nov. 22, police found 31-year-old Daniel Aaron and 30-year-old Kristen McDevitt stabbed to death inside their residence at the Camden Vantage Apartments in the 100 block of Jackson Street.

The investigation remains open. Officials did not rule out the possibility of more potential suspects when asked if Hamilton was the only person involved.

“We will see where the investigation takes us,” Lt. Ralph Woolfolk, Atlanta police homicide commander, said during a news conference Wednesday afternoon. “There’s still a substantial amount of work to do and we’re going to allow investigators to get back to work.”

Woolfolk released surveillance footage earlier this month that showed someone let Hamilton into the couple’s apartment the evening of their death.

Woolfolk described the man as an acquaintance of the victims. The footage showed the man emerge from the apartment about an hour and a half later carrying a large, square safe. He was wearing dark pants, a dark hat, a hoodie and a surgical mask.

Investigators had not found the safe as of Wednesday. Woolfolk said detectives have preliminary indications of the suspect’s motive, but he stopped short of disclosing any of the possible reasons for the slayings.