Cowlitz County Undersheriff Marc Gilchrist said a bow hunter found Sturm on Friday.
Sturm's daughter, Julie Nelson, told the Daily News of Longview that her father had been periodically confused recently. She calls the ordeal "a blessing in disguise" because it led to diagnosing the tumor. Sturm was sent Friday evening to a Portland hospital for additional evaluation.
The man was last seen Sunday evening when he left his daughter's Castle Rock house after dinner to return to his own home. The Daily News reports Sturm had only a candy bar to eat and scraped ice off his disabled truck's hood for drinking water. He wrapped himself in multiple sweatshirts and blankets.
He was treated for hypothermia and dehydration.