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(L-R) Mike Inez, Jerry Cantrell, William DuVall and Sean Kinney of Alice in Chains arriving at the Kerrang! Awards, at the Brewery, London. (Photo by Yui Mok/PA Images via Getty Images)

(L-R) Mike Inez, Jerry Cantrell, William DuVall and Sean Kinney of Alice in Chains arriving at the Kerrang! Awards, at the Brewery, London.   (Photo by Yui Mok/PA Images via Getty Images)

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ATLANTA, GA - SEPTEMBER 18: William DuVall (L) and Jerry Cantrell of Alice in Chains performs at Piedmont Park during day 1 of Music Midtown on September 18, 2015 in Atlanta, Georgia. (Photo by Scott Legato/FilmMagic)

ATLANTA, GA - SEPTEMBER 18:  William DuVall (L) and Jerry Cantrell of Alice in Chains performs at Piedmont Park during day 1 of Music Midtown on September 18, 2015 in Atlanta, Georgia.  (Photo by Scott Legato/FilmMagic)

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AMSTERDAM, NETHERLANDS - FEBRUARY 21: Alice in Chains (Layne Staley) perform at the Paradiso in Amsterdam, Netherlands on 12th February 1993. (Photo by Frans Schellekens/Redferns)

AMSTERDAM, NETHERLANDS - FEBRUARY 21: Alice in Chains (Layne Staley) perform at the Paradiso in Amsterdam, Netherlands on 12th February 1993. (Photo by Frans Schellekens/Redferns)

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AUSTRALIA - JANUARY 01: Photo of Jerry CANTRELL and ALICE IN CHAINS; Jerry Cantrell (Photo by Bob King/Redferns)

AUSTRALIA - JANUARY 01:  Photo of Jerry CANTRELL and ALICE IN CHAINS; Jerry Cantrell  (Photo by Bob King/Redferns)

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LONDON, UNITED KINGDOM - NOVEMBER 09: William DuVall and Jerry Cantrell of Alice in Chains performs at Alexandra Palace on November 9, 2013 in London, England. (Photo by Rob Ball/WireImage)

LONDON, UNITED KINGDOM - NOVEMBER 09: William DuVall and Jerry Cantrell of Alice in Chains performs at Alexandra Palace on November 9, 2013 in London, England. (Photo by Rob Ball/WireImage)