By the afternoon of Aug. 18, 2014, Broken Arrow resident Larry Clark had begun to suspect something was wrong with his 60-year-old brother Gary.

For about a week, Gary Clark had been acting erratic and delusional. He left clean clothes and cigarettes out in the rain, wasn't taking food, and burned some of his possessions in a trash barrel outside the small cottage he lived in behind Larry's house in rural Wagoner County.

Gary had been diagnosed with schizophrenia years earlier and was hospitalized multiple times after failing to take his medication. Larry was given power of attorney over Gary'...