Gov. Jay Inslee, left, addresses a news conference with Attorney General Bob Ferguson following an earlier announcement that Washington's Supreme Court unanimously struck down the state's death penalty, Thursday, Oct. 11, 2018, in Olympia, Wash. Washington has had a moratorium on executions since 2014, but the ruling makes it the 20th state to do away with capital punishment by legislative act or court decree. The court converted the sentences of the eight people on Washington's death row to life in prison. (AP Photo/Rachel La Corte)

Gov. Jay Inslee, left, addresses a news conference with Attorney General Bob Ferguson following an earlier announcement that Washington's Supreme Court unanimously struck down the state's death penalty, Thursday, Oct. 11, 2018, in Olympia, Wash. Washington has had a moratorium on executions since 2014, but the ruling makes it the 20th state to do away with capital punishment by legislative act or court decree. The court converted the sentences of the eight people on Washington's death row to life in prison. (AP Photo/Rachel La Corte)

OLYMPIA, Wash. (AP) — Washington’s Supreme Court unanimously struck down the state’s death penalty Thursday as arbitrary and racially biased, making it the 20th state to do away with capital punishment.

Execution was already extremely rare in Washington, with five prisoners put to death in recent decades and a governor-imposed moratorium blocking its use since 2014.

But the court’s opinion eliminated it entirely, converted the sentences for the state’s eight death row inmates to life in prison without release, and furthered a trend away from capital punishment in the U.S.

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“The death penalty is becoming increasingly geographically isolated,” said Robert Dunham, executive director of the Washington, D.C.-based Death Penalty Information Center. “It’s still on the books in 30 states, but it’s not being used in 30 states. It’s becoming a creature of the Deep South and the Southwest.”

Texas continues to execute more prisoners than any other state — 108 since 2010. Florida has executed 28, Georgia 26 and Oklahoma 21 in that timeframe. But nationally, death sentences are down 85 percent since the 1990s, Dunham said.

In the past 15 years, seven states — Connecticut, Delaware, Illinois, Maryland, New Jersey, New Mexico and New York — have abandoned capital punishment through court order or legislative act, and three — Colorado, Oregon and Pennsylvania — have adopted moratoriums.

In New Hampshire and Nebraska, lawmakers banned the death penalty but saw those decisions overturned by veto or referendum.

The concerns cited in those states have ranged from procedural matters, such as the information provided to sentencing jurors in New York, to worries about executing an innocent person or racial and other disparities in who is sentenced to death, as was the case in Washington.

“The death penalty is unequally applied — sometimes by where the crime took place, or the county of residence, or the available budgetary resources at any given point in time, or the race of the defendant,” Chief Justice Mary Fairhurst wrote in the lead opinion.

She added: “Our capital punishment law lacks ‘fundamental fairness.’”

Defense lawyers had long challenged the death penalty on those grounds, noting the state’s worst mass murderers and serial killers, Green River killer Gary Ridgway among them, had received life terms, not death. In a 5-4 ruling in 2006, the justices rejected an argument from a death row inmate that he shouldn’t be executed because Ridgway hadn’t been executed.

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This time, death penalty critics were armed with more data about how capital punishment works, including a statistical analysis by University of Washington sociologists. Their report showed that although prosecutors were not more likely to seek the execution of black defendants, juries were about four times more likely to sentence black defendants to death.

“Now the information is plainly before us,” Fairhurst wrote. “To the extent that race distinguishes the cases, it is clearly impermissible and unconstitutional.”

Gov. Jay Inslee, a one-time supporter of capital punishment, imposed the 2014 moratorium.

“Washington state is now among a growing number of states that has eliminated this costly and capricious sentencing program of capital punishment,” Inslee told a news conference. “The certainty of death in prison remains the same. Today’s decision does not let anyone out of prison.”

The ruling came in the case of Allen Eugene Gregory, a black man who was convicted of raping, robbing and killing Geneine Harshfield, a 43-year-old woman, in 1996.

“However one feels about the propriety of capital punishment in theory, in practice the death penalty is imposed in an unfair, arbitrary, and racially biased manner,” one of his attorneys, Lila Silverstein, said in a written statement.

Dozens of former state judges took the unusual step of urging the court to use Gregory’s case to strike down capital punishment. Among them was former Justice Faith Ireland, who sided with the narrow majority in upholding capital punishment in 2006.

The court did not rule out the possibility that the Legislature could come up with another manner of imposing death sentences that would be constitutional. The governor said he did not expect lawmakers to try, but if they did, he’d veto it.

Attorney General Bob Ferguson has said that he plans to ask the Legislature to move next session to take the death penalty law off the books, something Inslee said he’d sign.

Dunham said it was important that the ruling was based on the facts of Washington’s use of capital punishment.

“Those are issues that plague the death penalty everywhere it’s administered,” he said. “We’re certain to see prisoners challenging the death penalty in other states using the reasoning of the Washington Supreme Court.”

The court didn’t reconsider any of Gregory’s arguments pertaining to guilt, noting that his conviction for aggravated first-degree murder “has already been appealed and affirmed by this court.”

Earlier this year, the state Senate passed a measure abolishing the death penalty, but it failed to pass in the House.

“There is a profound shift in our state and country that the death penalty is below us as a civil, just and moral society,” Democratic Sen. Reuven Carlyle, who had been a sponsor of those previous attempts, said in a text message.

Republican Sen. Mike Padden, who voted against the death penalty abolition, said he was troubled by the ruling’s impact.

“The death penalty should be rarely used, but I do think it should be an option in the most heinous cases,” he said.

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AP writer Gene Johnson contributed from Seattle. Follow Rachel La Corte at https://twitter.com/RachelAPOly