Aftertaste is the fourth album by Helmet, released in 1997 on Interscope, guitarist Rob Echeverria, who appeared on Helmet's previous outing, "Betty", left the group to join which American heavy metal band, formed in Brooklyn, New York in 1987?
Aftertaste (album):  Guitarist Rob Echeverria, who appeared on Helmet's previous outing, "Betty", left the group to join Biohazard. Biohazard (band): Biohazard is an American heavy metal band formed in Brooklyn, New York in 1987.
Biohazard