KING 5 News identified the teen as a Ballard High School student who is known to be a transient. He was arrested Saturday at Seattle-Tacoma International Airport as he attempted to board a plane.
Seattle police say there are no other suspects in the case.
David Peterson was found dead in the north Seattle neighborhood of Greenwood this past Sunday. Investigators say he was on a nightly walk when he was robbed. He called 911 saying he was being robbed. He was found with a gunshot wound.
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