Among those killed at the July 30 mass shooting was Ivanov’s ex-girlfriend. Snohomish County Superior Court Judge Janice Ellis set sentencing for Jan. 12.

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Allen Ivanov, charged with fatally shooting three former classmates at a Mukilteo house party in July, pleaded guilty to the killings Monday, reportedly one day before a prosecutor was to announce whether to seek the death penalty against him.

The 20-year-old entered pleas to three counts of aggravated first-degree murder and two counts of attempted first-degree murder, according to the Snohomish County Prosecutor’s Office. He is accused of storming the party on July 30 and opening fire with an AR-15-style rifle that authorities say he had recently purchased.

“Hopefully, this will provide some measure of closure for the victims families,” Ivanov’s attorney, Tim Leary, said in a phone interview Monday. “The whole situation is a tragedy all the way around.”

Mukilteo shooting

One of the murder charges also carries a domestic-violence allegation in the death of Anna Bui, Ivanov’s ex-girlfriend. Also killed were Jake Long and Jordan Ebner. All three victims were 19 and were recent graduates of Kamiak High School, where Ivanov also went to school.

A fourth victim, Will Kramer, 18, was wounded. Ivanov also allegedly shot at two other people at the party, charging documents say.

All five counts each carry a firearm allegation.

Snohomish County Superior Court Judge Janice Ellis set sentencing for Jan. 12. Aggravated first-degree murder is a capital crime, punishable by either life in prison without release, or the death penalty.

Snohomish County Prosecutor Mark Roe was weighing whether to seek the death penalty for Ivanov. The (Everett) Herald newspaper reports that he was to make the announcement Tuesday.

“I was undecided as late as this weekend,” Roe said after a hearing Monday, the newspaper reports.

In pleadings filed this month, Ivanov’s attorneys said evidence suggests the 20-year-old has been living with untreated neurological problems and potential mental illness, and that more study is needed before prosecutors decide whether to seek execution. Preliminary testing suggests Ivanov has the brain development of somebody years younger, defense attorney Walter Peale wrote in the court papers.

The shootings took place just after midnight as friends gathered at a home in Mukilteo’s Chennault Beach neighborhood. Ivanov had recently broken up with Bui, but when he tried to reconcile, she rebuffed him, prosecutors have alleged. The pair met up as recently as a day before the shootings, but she indicated she wanted to move on with her life, the documents say.

Prosecutors allege Ivanov told at least two friends through texts and social media that he had recently purchased a firearm and planned to shoot his ex-girlfriend and others.

According to charging documents:

Ivanov crept up to the house to see what was going on when he encountered Long outside and shot him. A witness told police Long, Ebner and Kramer were sitting near an outdoor firepit just before the shooting.

When Kramer and Ebner heard the shots, Ebner walked toward the home and was shot. Kramer, who was shot next, then got up and ran into a wooded area and called 911.

Investigators said Ivanov then went looking for Bui and found her seated at a dining nook with friends inside the house. He shot her five times, the documents say.

The Washington State Patrol arrested him about 90 minutes later on Interstate 5 near Chehalis, nearly 100 miles away.

After his arrest, “Ivanov stated that everything that went on tonight was about a girl,” police wrote in the affidavit.