Steven DeMarchi is a Canadian guitarist, backing vocalist and songwriter. He is best known as the co-founder and lead guitarist of the bands Sheriff (1979–1985) and Alias (1988–1991). DeMarchi also played guitar for The Cranberries (1996–2003) and was the main guitarist for Dolores O'Riordan (2005–2008). As a Billboard hit songwriter, DeMarchi is known for co-writing the hit songs "More Than Words Can Say", a 1990 Number 1 hit on the BillBoard Hot AC chart and Number 2 on the Billboard Hot 100 and “Haunted Heart”, a 1990 Number 18 hit on the US Mainstream Rock chart.