The Nevada Supreme Court ruled Thursday that a Salvadoran immigrant accused of killing four people during a string of crimes in 2019 must be tried separately in both counties where the slayings took place.

Prosecutors argued that Wilber Ernesto Martinez Guzman should be tried for all four killings in Washoe County, where a grand jury indicted him on four murder and five burglary charges.

In a 5-2 decision, the justices agreed with Martinez Guzman’s public defenders that he is entitled to two trials, one in Washoe County for the deaths of a Reno couple and another in Douglas County for two women who were fatally shot in separate homes in rural Gardnerville.

The court ordered a Washoe County judge to dismiss the charges related to Douglas County because the grand jury in Reno lacked proper jurisdiction to indict him for those crimes.

The trial had been scheduled to begin early next year in Reno. Martinez Guzman was in the country illegally and had worked as a landscaper at all three properties where the four were killed over a two-week period, police said. They said he confessed to the shootings.

They say he stole a .22 caliber revolver from Gerald and Sharon David’s Reno home on Jan. 4, 2019, burglarized and killed Connie Koontz five days later, then did the same to Sophia Renken the next week before burglarizing and killing the Davids on Jan. 15.

Prosecutors said the ruling will further delay a resolution in the case and that they will have to prosecute the same facts twice.

However, Washoe County District Attorney Chris Hicks said the prosecution remains his highest priority. Douglas County District Attorney Mark Jackson said the families of the victims “know our commitment to seeking justice for the senseless murders of their loved ones.”

They are seeking the death penalty if Martinez Guzman is convicted in the killings.

Prosecutors had argued that Nevada law allowed for one trial because the facts in the cases were “intertwined,” including evidence showing Martinez Guzman shot all four victims with the same gun he stole from the Davids’ residence.

Those theories “were too speculative and unsupported by the evidence” to allow the Douglas County killings to be tried in Washoe County, Justice Lidia Stiglich wrote in the majority opinion.

Justice Kristina Pickering, joined by Justice Ron Parraguirre, wrote in dissenting opinion that prosecutors had presented enough evidence that all the crimes were interconnected to warrant one trial in Washoe County.