He is best known for his involvement with the band Sheriff from 1979-1985, the band Alias from 1990-1991, the band The Cranberries from 1996-2003 and as guitarist for Dolores O'Riordan from 2003-present.
He is best known as the co-founder and lead guitarist of the band Sheriff from 1979-1985 and the band Alias from 1990-1991. DeMarchi played guitar for the band The Cranberries from 1996-2003 and is the main guitarist for Dolores O'Riordan from 2003-present.