Stephen "tWitch" Boss, choreographer, DJ and co-host for "The Ellen DeGeneres Show" has died. He was 40. The famed dancer and DJ, known for his yearslong role on Ellen DeGeneres' daytime talk show, died Tuesday, according to a Los Angeles County medical examiner report. Boss, known as "tWitch Twitch" on DeGeneres' daytime talk show, joined the show as a guest DJ in 2014 before becoming a permanent fixture and later being named the show's co-executive producer in 2020.