Casisdead started his music career in 2005 under the name Castro Saint before taking a five-year break and returning in 2012 with a new persona.

Originally known as Castro Saint, Casisdead began rapping in 2005, producing tracks rooted in his experiences in Tottenham. After a hiatus from 2007 to 2012, he re-emerged as Casisdead, adopting a masked persona. This return marked a prolific period, with a distinct cinematic and dark style that set him apart in the UK grime and hip hop scenes.