I am sorry about your loss as well, and do think you did the right thing. One of the issues that families face when elderly drivers become unsafe (vs being a killer, how nice...) is that the loss of freedom that the driver's license represents can have serious detremental effects on their physical well being. Doctors have a tough choice to make when they council people to give up their driving. Some people have no problems with it, but some have hung onto that license like a life line, literally.
N_C: sorry mate, you are dead wrong. People can and do think themselves to death more than most realize. I know of several people who were in otherwise ok shape for their age who just gave up when a loved one died. They died for no apparent reason shortly after.