Lt. Lance Inman says the woman called 911 on Monday while her husband tried to keep the intruder from fleeing.
Police found the man wearing only a towel around his waist as the homeowner continued trying to restrain him. Police arrested the man.
Inman says the man claimed the homeowner had allowed him to camp in the backyard so he thought it was OK to go inside and shower. He apparently entered through an unlocked rear door.
Officers found a tent in the backyard. However, they say the homeowners didn't know the man and hadn't seen him before.
Inman says 29-year-old Francis Lucero of La Center, Wash., was taken to the Marion County Jail.
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