William DuVall is an American musician, best known as the co-lead vocalist and rhythm guitarist for the Rock band Alice in Chains since 2006. DuVall has recorded two albums with Alice in Chains: "Black Gives Way to Blue" in 2009 and "The Devil Put Dinosaurs Here" in 2013. DuVall is also the co-founder, lead singer, guitarist and lyricist for the band Comes with the Fall.