Man convicted in brutal cold case killing set to be released

Arnold Aggas Sr. (Siskiyou County Sheriff's Office)

The man convicted in a cold case killing dating back to 1989 is set to be released Feb. 23, according to the Siskiyou County Sheriff's Office.

Arnold Aggas Sr. was sentenced to serve 13 years in prison for two counts of voluntary manslaughter and one count of preventing a witness from testifying.

These charges came after he shot and killed then 19-year-old Kimberly Kantonen and her unborn child.

Kantonen was four months pregnant with Aggas's grandchild when she went missing from the Hornbrook property she lived on with Aggas and his son.

Police arrested Aggas in 2011 following a break in the case. He is now 74 years old.

According to Siskiyou County Sheriff Jon Lopey, Aggas received credit for time served and work credits within the prison system.

"It's not uncommon," said Lopey.

Dora Summers, a woman related to the case, said she is extremely concerned about his release.

"I don't feel that the community will be safe," she said. "He's not someone that will just go run and hide and say, 'Okay, I did something bad.'"

Summers knew Kantonen in the years leading up to her murder.

She remembers her as a very happy person-- one who was in love with Agass's son and was extremely excited to be a mother.

Kantonen's body was never located. According to Sheriff Lopey, the killing may have been sexually motivated.

Lopey said pursuing cold cases like Kantonen's is difficult, as witnesses pass away, evidence degrades, and in cases like this one, there's no body to examine.

However, the Siskiyou County Sheriff's Office is continuing to work years-old cases through their Major Crime Unit.

Lopey said the team is actively investigating at least three cold cases, and looking into several others.

While solving the cases won't lessen the pain of the past, Lopey hopes it can bring some kind of relief to the victims' loved ones.

"It's an ongoing effort to investigate these cold cases," Lopey said. "We will not forget them."

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