Deputy prosecutor Ed Stemler wanted to make doubly sure that Wallin is never again free to abuse children.
On Wednesday, Wallin was sentenced to serve a second term of life in prison without the possibility of release.
Wallin, 33, beat the rap once before after getting a favorable decision from the state Court of Appeals that vacated a 2003 sex conviction and a life prison term attached to the conviction.
Stemler said he didn't want to take any chances of another reversal on appeal.
"We wanted to do everything in our power to make sure he is never released," Stemler said after Wednesday's sentencing.
In May, Wallin was convicted of 11 offenses against girls 7, 9 and 11 and received a life prison term under the state's "persistent offender" law.
The life term imposed Wednesday stems from a January conviction involving four serious offenses against a girl who was about 8 years old in 2002 and 2003. Snohomish County Superior Court Judge Michael Downes imposed the sentence.
Under the law, two convictions of serious sex offenses merits a prison term of life without possibility of release.
Wallin has a long-standing pattern of establishing trust with adults and abusing their children.
In 1994, he was convicted of child molestation and served more than four years behind bars after he failed to complete a treatment program that might have helped him control deviant urges. He was released in 1998.
While still under state supervision for that crime, he was convicted of child molestation and other sex offenses in 2003 after a state corrections officer searched his laptop computer and found child pornography.
He was sentenced to life without release then, but the state Court of Appeals reversed the conviction. The court ruled that the corrections official made an improper search, and Wallin was freed.
Wallin was living in Everett on Aug. 6, 2006, when he and his girlfriend took three little girls to a park, photographed them and then engaged in sex in front of them. A jury in May convicted Wallin of 11 sex counts.
In the latest conviction, a jury found Wallin guilty of four sex counts. The victim is a daughter of a friend.
On Wednesday, Stemler told Judge Downes that Wallin has earned the second life sentence because he violated the trust of a friend and repeatedly raped and molested the friend's child.
In court documents, Stemler noted that Wallin got a "miraculous chance" at freedom when the 2003 sex crime was reversed.
Wallin "reoffended with three new victims within nine months of his release," Stemler said. "This defendant preys upon innocent children to feed his self-absorbed, lustful desires."
Reporter Jim Haley: 425-339-3447 or firstname.lastname@example.org.
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