You know Una, in Spanish nouns have genders and "muerte" is a feminine noun, therefore it can't be "del muerte", but "de la muerte".
Also "mal" is a masculine countable noun and can't be preceded by "nada". The correct adjective pronoun to use with it would be "ningún".
"nada" means "nothing" that's why I didn't use "mal" or it would be as saying in English: "I will not fear nothing evil (with "evil" being a noun) " See what I mean?