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Abigail Kopf, who was 14 at the time, was shot in the head during the restaurant shooting and survived. Tiana Carruthers was injured in a residential area.

Dalton had been deemed competent to stand trial and last week dropped an insanity defence. In court, he didn’t explain why he randomly shot eight people.

Dalton, the father of two children, had worked as an insurance adjuster and had no previous criminal record before the February 2016 shootings.

Prosecutor Jeff Getting said the motive behind the shootings is a question that “haunts us.”

“Everybody wants to know,” he said during a news conference after the court hearing.

Defence attorney Eusebio Solis said he advised Dalton not to plead guilty.

“But in speaking to Mr. Dalton, there are reasons” for the plea, Solis told Judge Alexander Lipsey. “There are personal reasons for him. He does not want to put his family through that, or the victims’ families, through the trial. It’s his decision.”

A gun shop owner said Dalton bought a jacket with an inside pocket designed to hold a gun just hours before the rampage. Shop owner Jon Southwick recalled Dalton “laughing and joking,” and giving a “one-armed hug” to the manager before making the purchase.

Following the guilty pleas, Getting praised investigators and others who helped during the case, especially Alexis Cornish. She was dating Tyler Smith and was in a vehicle when he and his father were shot while looking at pickup trucks.

Cornish was “extraordinarily brave” to immediately get a phone from her boyfriend’s pocket and call 911, the prosecutor said.

Dalton’s relatives and former wife released a statement, expressing condolences to Kopf, Carruthers and the victims’ families for “this senseless tragedy.”

“Nothing that we can say is adequate, but please know that our hearts are broken by the suffering which has resulted from the actions of our son and former husband,” the statement said.