Jeffrey John "Jeff" Hanneman (January 31, 1964 – May 2, 2013) was an American musician, best known as a founding member of the American thrash metal band Slayer. Hanneman contributed both lyrical and musical material to every Slayer album and wrote the songs "Raining Blood," "War Ensemble," "South of Heaven," "Seasons in the Abyss," and "Angel of Death," all of which have been played at almost every live Slayer performance after their respective compositions.