Does the promise still stand?

Years ago a customer at my work did a very generous, kind thing for me and made me promise not to tell anyone what she did. I have kept the promise. Well a couple of days ago I found out that she died last week and I have been wanting to tell people who knew her how kind she was to me years ago.
So would I be breaking the promise I made if I mentioned what she did, since she is dead now? Genuinely curious. I'm a very honest, moral person and would never want to break a promise I made. Not sure if her death would mean the promise is void now?