Atlanta police on Thursday charged a young man with the fatal shooting last month of former unified cruiserweight champion O'Neil "Supernova" Bell.

Bell, 40-years-old, was killed during a robbery after leaving a bus, said police, who found him lying in the street on November 25. A second man was also shot but survived.

Tycorion Davis, 18, was charged with killing Bell, Atlanta homicide commander Charles Hampton said in a news conference.

"We're still looking for one more individual, possibly two," Hampton said.

He called the robbery "a crime of opportunity," but did not disclose further details.

Bell, who was born in Jamaica, initially boxed with the nickname "Give 'Em Hell" and then later changed it to "Supernova."

He became the undisputed cruiserweight champion in 2006 when he unified the World Boxing Council, World Boxing Association and International Boxing Federation titles after a 10th-round knockout of Jean-Marc Mormeck in New York.