former wisconsin sheriff 's deputy andrew steele found not legally responsible in the killing of his wife and sister-in-law .
defense attorneys argued that the disease damaged steele 's brain , making him not criminally responsible for the deaths .
during steele 's trial earlier this month forensic psychiatrist dr. doug tucker had testified that a rambling note steele wrote about suicide and sexual relations with his wife and sister-in-law was delusional and showed steele 's brain was deteriorating because of als .
tucker said that was the reason steele killed the two and that he was ` unable to conform his conduct to the law .