After I went away to college, he moved from his original home in the New York City area into a former chicken coop on his property, about 100 yards down the road from my parents. And he married one of his "cousins", who had just turned 18. He was close to 70 then.
He turned out to be a miserly and abusive husband, and his young bride divorced him after a few years. He was furious at her for having an independent streak and rejecting him. So he began asking around to see if anyone could put him in touch with a hitman. He was determined to have his ex-wife killed.
Luckily for her, he was stupid and arrogantly careless. Several of the people who he approched in his search for a hired killer were decent human beings, and alerted the cops about him. The State Police arranged for an undercover officer to play the role of a hitman, and soon had plenty of evidence against him.
He was arrested and put on trial. His defence attorney tried to claim that Alzheimers had clouded his judgment, but the judge didn't buy that. He pled guilty and went to prison.