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The decision brings an end to the years-long court saga for Alexander Vanags that included three separate trials.
No one was hurt, but the fire destroyed a travel trailer and damaged a nearby home.
A witness says he accidentally shot himself in the leg when he tried to take his gun out of its holster.
Police say there is no threat to the public at this time.
In total, the two are suspected of causing over $15,000 worth of damage.
67-year-old Lynda Mercy will now await her sentencing on March 5.
Police say he pointed a pistol at someone before recklessly chasing them across the city.
The men are believed to have stolen nearly $1.5 million in valuables from homes in Bellingham, Anacortes and other areas across northwest Washington.
His actions came in response to a drive-by shooting that hit an acquaintance.
Deputies arrived to find the suspect had returned to the Port of Entry, where he was taken into custody.