My father killed himself when I was pregnant with my second child.
My mother told me that I "obviously didn't love him because I wasn't crying enough." WTF?
Please try not listen to what other people say. A death is always complicated and suicide even more so. It tends to bring out the worst in some people.
Live a good life.
Love your baby.
You living a fulfilling, happy (ok happy and complicated), and non-addicted life is the best legacy for your mom.