Angel Theory is an American actress known for playing Kelly on the series The Walking Dead She is also a dancer and choreographer Theory was born in Far Rockaway Queens New York Her mother is Anna Simpson Theory trained as a dancer in multiple styles of dance at the Broadway Dance Center EXPG studios and Peridance Studios She performed in the music videos for Wish You Were Mine by Phillip George and Stranger To Love by Charles Perry After a car crash she began experiencing hearing loss at age 14 Her hearing loss progressively worsened as she got older Theory told Insider I remember how depressed devastated and angry I got with myself after my hearing loss My mom told me Its not a disability its your damn superpower For the television series The Walking Dead she applied for the role of Connie Showrunner Angela Kang told Insider they were so compelled by Angel she was cast as Connies sister Kelly Kang also told Insider that with Theorys agreement her progressive hearing loss has been incorporated into the plot of The Walking Dead including the line of encouragement from her mother Theory has also been teaching American Sign Language ASL to the cast of The Walking Dead Theory also stars as Olivia a hard of hearingdeaf teacher in the series Kinderfanger and is an executive producer In her role as coexecutive producer Theory has been able to advise the show creators about realistic representation of Hard of Hearing or Deaf people