"Just hearing Chris’ voice helps, I know he did that for everyone he knew," Shepherd wrote on the eighth anniversary of Cornell's passing.
Speculation as to the future of Death Grips arose in February when supposedly leaked messages from producer Andy Morin cast doubt on their current status.
The new book will collect “handwritten lyrics, deeply personal poetry, stunning original artwork, rare photos, [and] fan tributes” from the late Alice in Chains frontman.
