Amy Ming is 82 years old. That doesn’t necessarily rule her out as a potential killer, but it surely suggests she didn’t kill anyone for money. And as Marisa Hightower’s financial advisor, she was well aware of Hightower’s situation. Ms. Ming, if we believe her, was well off. And there was nothing in the relationship going back to their political activism in the 2010s to suggest any motive for wanting to harm Ms. Hightower. Though Ms. Ming was sitting close enough to Ms. Hightower to possibly add something to her drink, she would not have had access to the drinking glass beforehand.