Brandon Mellon was taken to a hospital in Portland in critical condition.
The Spokesman-Review reports he's under guard and will be returned to Spokane for the homicide case.
Police say investigators had determined Mellon was a person of interest in Friday's shooting and they were looking for him before the Pasco shooting.
KHQ-TV reports the Spokane County medical examiner has identified the victim as Arnold Lommasson, 48, who died from a gunshot wound to the head.
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