Fox News:   
Washington St. Resident Arrested after shooting an intruder that was "taking a shower" in shooter's home...
It  would seem that the crux will be surrounding the Washington state  "Castle Doctrine" laws, assuming there are any.  Some are arguing on  other FL 2A forums that if this had happened in FL, the "presumption" of  "fear of life/great bodily harm"  exists, per FL's Castle doctrine  statute, and would justify the use of deadly force in this case, even  though the shooter left the house, came back with a gun and then shot  the intruder without contacting the police.   Others argue that the FL  castle doctrine does not extend that far, and that the defendant would  be very hard pressed to justify said actions to a FL jury, as it seems  this gentleman will have with a Washington Jury.
<popcorn>