CASisDEAD is a UK rap and grime MC and producer from Tottenham, London. He first begins rapping in 2005 under the name Castro Saint, then resumes his music career in 2012 using the name CASisDEAD. Since then, he appears in public and in videos wearing a mask, which has led to speculation about his identity.

He owns the label IM REALLYDEAD and releases his own music through it.