This is very sad news, thanks for sharing.
When we got engaged, my husband and I gave each other our favorite personal finance book to help share our financial philosophies. I recommended the "total Money Makeover" by Dave Ramsey, but my husband suggested "the millionaire next door" to me. I could barely put it down the first time I read it, and it helped set us up for our marriage which has ( so far, fingers crossed) been blessed with easy communication and decision-making about money.
I hope his daughter continues his work; it would be great to see the updated statistics.
RIP, thanks from one woman whose life you touched.