Published Tuesday, 24 April 2012
The 33 year old was part of the group's touring band and he also featured on The Killers' albums Sam's Town and Day and Age.
A statement from Brandon Flowers and his bandmates reads: "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."
Marth also performed with Las Vegas band the Big Friendly Corporation, which featured his sister Melissa and brother Ryan.
Group founder Timothy Styles has suggested his friend's death will be investigated, stating, "People who know him will hear the truth about it (death) later on. But it's not natural causes."