Utah has passed a law to become the only state in the United States to allow execution by firing squad.
Governor Gary Herbert has signed a law approving the controversial method's use when no lethal-injection drugs are available.
Herbert has said he finds the firing squad "a little bit gruesome", but Utah is a capital punishment state and needs a backup in case a shortage of the drugs persists.
"We regret anyone ever commits the heinous crime of aggravated murder to merit the death penalty, and we prefer to use our primary method of lethal injection when such a sentence is issued," Herbert spokesman Marty Carpenter said.
"However, when a jury makes the decision and a judge signs a death warrant, enforcing that lawful decision is the obligation of the executive branch."
The measure's approval is the latest illustration of some states' frustration over bungled executions and difficulty obtaining the drugs.
Utah is one of several states seeking new forms of capital punishment after a botched Oklahoma lethal injection last year.
States have struggled to keep up their drug inventories as European manufacturers opposed to capital punishment refuse to sell the components of lethal injections to US prisons.
Many argue that a team of trained marksmen is faster and more decent than the drawn-out deaths involved when lethal injections go awry - or even if they go as planned.
Opponents say firing squads are barbaric, with the American Civil Liberties Union of Utah saying the bill makes the state "look backward and backwoods".
Utah lawmakers stopped offering inmates the choice of firing squad in 2004, saying the method attracted intense media interest and took attention away from victims.
Utah is the only state in the past 40 years to carry out such a death sentence, with three executions by firing squad since the US Supreme Court reinstated the death penalty in 1976.
The last was in 2010, when Ronnie Lee Gardner was put to death by five police officers with .30-calibre Winchester rifles in an event that generated international interest and elicited condemnation from many.
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