In this case, the wife would benefit from life insurance money. The injury was caused by a single car accident, which meant that there was nobody to sue. So, the sooner he died, the sooner she would benefit.
In Terri’s case, Michael Schiavo sued the hospital and doctors for his “loss of companionship” and medical malpractice (as Terri’s guardian). He was given an award for the loss of companionship (which was ironic because he was living with another woman, who is now his wife) and Terri was awarded money for rehabilitation. He used Terri’s money to pay lawyers to kill her.