Alan Smith was taken into custody at a Bothell cafe for investigation of obstruction of justice for refusing to give up his passport, police said.
The arrest came just hours after Smith gave his first interview since his wife was murdered. In it, he denied having any role in Susann Smith's February death.
"She was the love of my life for a while and the mother of my children, and my heart breaks," Smith said.
Despite professing his innocence, Smith admits he worries about being charged.
"Yes, that certainly was a very, very big concern at the outset and when I was much more preliminary in my healing process and I wasn't thinking as rationally as I am now, so it remains a concern," he said.
After the murder, Smith moved back into the home where Susann was bludgeoned to death.
He moved into the house because the lease was up on his apartment and he was facing financial difficulty, but he said it has been difficult to live in the same house where the mother of his children died.
"Yeah, it's quite difficult for many obvious reasons," he said.
Smith's two children are currently in state custody, and he said his main objective is to get them back.
"I'm not even going to attempt to describe how it's been," he said. "On the other hand, the challenge that was brought into my life has facilitated lot of healing. A lot of craziness that accompanied the healing, and a lot of new awareness a lot of wisdom."
Smith previously was considered a "person of interest" in the murder, but on Thursday Bothell police said he is now considered a suspect.
Thursday's arrest was Smith's second run in with the law this week. On Monday, neighbors called police after they heard a woman screaming. When officers arrived, they found Smith and his girlfriend, Love Thai, having sex in the yard.
Smith was not arrested or cited for the Monday incident.
Thai said police have warned her that Smith is a sociopath, but she doesn't buy it. And she doesn't think he's guilty of murder, either.
"I have told my family that if all the evidence comes and there's evidence against him, I will stand by him because in the end it's about forgiveness," Thai said.
Thai also spoke of when she first met Smith, which was soon after Susann was murdered.
"We just had four days of pure bliss and ecstasy and making love for 24 hours, seven days a week and then me sleeping and him cooking for me," she said.
Smith is currently in custody and is expected go before a judge Friday morning.