Jeff Hanneman, Photo Courtesy of Slayer.netJeff Hanneman, Photo Courtesy of Slayer.netYou don’t need to be a fan of heavy metal music to be familiar with the band Slayer. Thanks to their graphic lyrical depictions of Satan worship, serial killers, and the horrors of war, the California thrash act has long enjoyed a well-earned notoriety—not to mention sold-out concert tours and album sales numbering in the millions. Guitarist Jeff Hanneman, one of the band’s founders and principal songwriters, died Thursday of liver failure. He was 49 years old.