Marg, I'm so sorry for your loss.
So far, the NTSB has filed (for public access) more than 100 documents, reports, video animations, etc. relating to the investigation of the crash. The download page begins HERE. I didn't open or read anything in detail, but it would appear that the investigation is ongoing as the last posting was in June, and I didn't see anything labeled "Final Report" or anything similar.
Hope this helps!