One week after the passing of Slayer guitarist Jeff Hanneman, the exact cause of death has been revealed. Alcohol-related cirrhosis—an irreversible liver disease—claimed Hanneman's life, according to a post on the metal band's site.

"Jeff and those close to him were not aware of the true extent of his liver condition until the last days of his life. Contrary to some reports, Jeff was not on a transplant list at the time of his passing," Slayer wrote.

Sadly, his friends and bandmates were under the impression he was recovering. "By all accounts, it appeared that he had been improving—he was excited and looking forward to working on a new record," Slayer said.

Individual members of the pioneering thrash outfit paid tribute to Hanneman yesterday, talking about the Slayer co-founder's extensive WWII knowledge and how "he wrote so many of the songs that the band will always be known for."

Slayer will hold an open-to-the-public celebration of his life later this month, with the exact date TBD.