An Idaho judge on Saturday sentenced a man to death, two days after he was found guilty of first-degree murder and other charges in the 2019 killings of his first wife and two of his current wife’s children, capping a case that drew scrutiny because of the couple’s “doomsday” religious beliefs.

The decision came after jurors took more than a day to deliberate during the special sentencing proceeding in the case against the man, Chad Daybell, 55, in Ada County District Court in Boise, Idaho.

Earlier on Saturday, the jury had recommended the death penalty before the judge ordered a short recess to make a final sentencing decision.

As the judge, Steven W. Boyce of the Seventh Judicial District, read his sentencing decision, Mr. Daybell sat with his hands in his lap, expressionless at the defense table. Defense lawyers did not have any questions when asked by the judge.

On Friday, relatives of the victims delivered statements, often struggling for words.

Prosecutors said the death penalty was justified, pointing to aggravating factors. They argued that the crimes were particularly “heinous, atrocious or cruel”; that Mr. Daybell was motivated by the desire for remuneration; and that he continued to represent a danger to society.

Lindsey Blake, a prosecutor, described extreme religious claims by Mr. Daybell of having visions in which he could determine whether someone was “dark” or “possessed,” in which cases “the body had to be destroyed or die.”