The best way to finish is by looking ahead to the future and issuing a call to action – something like:

You will commemorate X best by keeping her memory alive. So go on telling the stories; tell them over and over; they’ll never get tired or dusty or faded. Tell them to people who never met her. Because X’s life story is the stuff of legend. Keep the legend alive.

Okay, so that’s a bit over the top, but you get the message.