PHOENIX (AP) — More than three decades after a vengeful crime shook a Phoenix family, the man responsible is slated to face the ultimate penalty. Richard Kenneth Djerf, 55, will be executed on Friday, marking Arizona’s second execution this year.

The execution is scheduled to occur at the Arizona State Prison Complex in Florence, with Djerf receiving a lethal injection of pentobarbital. He had admitted to the murders of Albert Luna Sr., Patricia Luna, their 18-year-old daughter Rochelle Luna, and their 5-year-old son Damien Luna on September 14, 1993. Despite being incarcerated for nearly three decades, Djerf has declined to pursue clemency.

If carried out, this will be the fourth execution in the United States this week and the 39th throughout the year.

According to prosecutors, Djerf harbored animosity toward Albert Luna Jr., a family member who was not present during the murders, for stealing electronics from Djerf’s apartment. Consumed by the desire for retribution, Djerf approached the Luna residence months later under the guise of delivering flowers, as per the prosecution’s account.

Prosecutors said Djerf blamed another family member, Albert Luna Jr., who did not witness the killings, for an earlier theft of electronics from his apartment. Djerf became obsessed with exacting revenge and went to the home months later claiming to be delivering flowers, prosecutors said.

Authorities say Djerf sexually assaulted Rochelle Luna and slashed her throat; beat Albert Luna Sr. with an aluminum baseball bat and stabbed and shot him; and tied Patricia and Damien Luna to kitchen chairs before fatally shooting them. During Friday’s execution, a team of four people including medical doctors and a phlebotomist will prepare syringes of saline and pentobarbital, insert an IV and inject the chemicals into Djerf. Arizona has been criticized in the past for taking too long to insert IVs during lethal injection executions. Experts say it should take seven to 10 minutes from the beginning of insertion until a proclamation of death. The state has paused executions twice since 2014 amid concerns over its use of the death penalty.

There was a nearly eight-year hiatus brought on by difficulties in obtaining the needed drugs and criticism that a 2014 execution was botched: Joseph Wood was injected with 15 doses of a two-drug combination over two hours, leading him to snort repeatedly and gasp hundreds of times before he died.

Executions resumed in 2022, and three prisoners were put to death that year. They were paused again in 2023 after Democratic Gov. Katie Hobbs ordered a review of the capital punishment protocol and Democratic Attorney General Kris Mayes agreed not to pursue any. The review ended in November 2024, when Hobbs fired a retired federal magistrate she had appointed to examine execution procedures, and the state corrections department announced changes in the lethal injection team.

Arizona last carried out a death sentence in mid-March, executing Aaron Brian Gunches for the 2002 killing of Ted Price.

There are currently 108 prisoners on the state’s death row.