His lyrics are mostly based on Satanic subjects, which he attributes to his love of horror movies. Though many fans regard him as being a Satanist, he regards these people as "dumb".
In addition to apperaring on Slayer's albums, he has also made guest appearances as lead guitarist, including:
He is noted for openly speaking his mind, which has lead to arguments with various other bands, including Metallica, when he branded Kirk Hammett "the most overrated player ever to grace the pages of a guitar magazine".
Massive tattoo work covers King's hands, arms, and head.