Continuing his junior career, he won the USATF Junior Championships in 1990, setting a meet record of 8.17 metres (26.8 ft)[4] which qualified him for the International team. He was also Junior National Champion at 200 meters.[5] In Plovdiv, Bulgaria, he won the 1990 World Junior Championships in Athletics, setting a personal best of 8.20 metres (26.9 ft) in the qualifying round, the # 152performance on the world all-time list.[6] He also won a Bronze medal in the 200 meters in that same competition. In 1991, as a 20-year-old, he placed second behind Mike Powell in the United States Olympic Festival.[7]
After a 9-year absence from competition Stallworth returned to competition in 2000. He achieved a 7.93 metres (26.0 ft) long jump in a local championship in Long Beach, California.[8] but did not make the Olympic team.
As of 2017, Stallworth was working as a warehouse worker[9] at a Rescue Mission.