Marth, who was 33, played live with the Killers between 2008 and 2010, and he appeared on their albums Sam's Town and Day & Age.
Marth was found dead on Monday, and his death was ruled a suicide by officials in Clark County, Nevada. On Monday the Killers wrote on Twitter, "Last night we lost our friend Thomas Marth. Our prayers are with his family. There's a light missing in Las Vegas tonight. Travel well, Tommy."