CASisDEAD is a UK rap/grime MC & producer from Tottenham, London.

He is the owner of the label IM REALLYDEAD, through which he releases his own music. He began rapping in 2005 under the name Castro Saint. He resumed a music career in 2012 under the name CASisDEAD; since then he has worn a mask during all public appearances and videos, this has led to speculation over his identity.