Michael Sean Stanley met the boy at a west Seattle grocery store, struck up a conversation and walked with him to an alley where police say he plied the teen with alcohol. Stanley grabbed the teen and sexually assaulted him, police said.
The boy pulled a knife and was able to run away and contact police.
Detectives believe the incident happened before police received several calls reporting noise in an alley and Stanley threatening someone who asked him to be quiet.
When police arrived, Stanley became combative and said he had a knife. He appeared intoxicated, according to authorities. He was arrested and jailed for investigation of harassment.
Stanley was released from jail in Canada in April 2011 after completing a 32-month sentence for assault and forcible confinement. He was being monitored by police under a peace bond, which Canadian authorities can get to impose conditions on individuals in the community. His peace bond has 20 conditions, including one ordering him to stay away from children.
Police in Canada issued a public alert earlier this month after Stanley cut off his electronic-monitoring bracelet. Officials described him as an untreated, violent offender who posed a significant risk.
An American citizen, Stanley crossed the border and was located in the Seattle area last week. Canadian officials decided not to seek extradition.
He registered as a sex offender with the King County Sheriff's Office and listed his address as an intersection just a block away from Pike Place Market. It's also near a preschool, even though he had been ordered to stay away from children in Canada.
There was no reason to arrest Stanley earlier since Canada hadn't pursued an extraditable warrant and he wasn't wanted for any crimes in the United States, authorities said.
Edmonton, Alberta, police spokesman Chad Orydzuk told The Associated Press that Stanley's arrest in Seattle was "unfortunate but we can't provide comment. It's not our file."
"If he continues to break the law down south you can imagine how difficult it would be for us to comment if he broke the law in different jurisdictions in the States. For us to comment on that, we couldn't keep up with that, if this was to continue," he said.
Orydzuk said when Stanley breached the monitoring conditions in Edmonton, officials searched for him and notified the public and other agencies. Unconfirmed sightings of Stanley led schools in several west-central Saskatchewan communities to lock their doors and keep children inside.
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