David Kalac's arrest last night nearly 320 kilometers from the crime scene in Washington state came after a daylong manhunt.
He is accused of killing Amber Lynn Coplin, whose teenage son heard the couple loudly arguing and then found his mother dead in their apartment.
Kalac, 33, sent a text message to a friend Tuesday morning to say he would read about Kalac in the news, then evaded police in the woman's stolen car until he emerged from a wooded area and turned himself in to a passing police officer, authorities said.
The images appeared on 4chan, an online bulletin board whose free-wheeling and anonymous nature has led to some of the Web's darker moments.
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Earlier this year, hundreds of private pictures of nude celebrities were posted on the site.
Kalac is the sole suspect, so investigators believe he shared the photos, commented online about how the woman was killed and wrote of planning to be fatally shot by police, Wilson said.
The suspect yesterday gave himself up to an officer patrolling the area around a transit center in Oregon, about 32 kilometers south of Portland.
Kalac was cooperative but provided no details about how he got to Wilsonville, the spokesman said.
Kalac was charged with second-degree murder and was held in Portland on USD 2 million bail.
Washington state detectives aim to interview him and pick up the slain woman's car, a 2001 Ford Focus found yesterday afternoon in Portland, about 257 kilometers south of the crime scene.