Stephen's wife Allison Holker Boss confirmed his death.
Stephen was a freestyle hip-hop dancer, choreographer, actor, TV producer, and TV personality from the United States.
Boss first gained popularity as a participant on MTV's The Wade Robson Project before finishing in second place on Star Search.
Boss later took part in So You Think You Can Dance competitions in 2008, finishing the fourth season as runner-up and later making a comeback as an All-Star.
When the show came back in 2022, Boss served as a judge.
Boss appeared in Ellen's Game of Games as DeGeneres' sidekick.
Boss co-hosted Disney's Fairy Tale Weddings on Freeform and Disney+ between 2018 and 2020 with his wife Allison Holker.