Toyota's empathetic car of the future is there for you. You've had a frustrating day at work; it plays soft music and lowers the temperature. You're lost in an unfamiliar neighborhood; it offers to take over the driving. You start to nod off at the wheel; it taps you on the shoulder and starts up a conversation.
When police responded to a home in Bentonville, Ark., one Sunday morning last November, they discovered Victor Collins's dead body in the backyard, floating face up in a hot tub. Police records describe a grim scene: Collins's left eye and lips were dark and swollen, and blood and pink foam appeared to be coming out of his nose. The water inside the spa had turned a dark reddish hue, seemingly discolored by blood, feces and vomit.