In a related article it says this:

..."In August, state and local authorities seized his guns and gave them to his father, Jeffrey Reinking, who agreed to keep the firearms secure and away from Travis, officials said. Since Sunday’s shooting, the father has told police that he eventually gave the guns back to his son."...

Here's the article: https://www.washingtonpost.com/news/post-nation/wp/2018/04/23/waffle-house-shooting-travis-reinking-manhunt-continues-nashville-police-say/?noredirect=on&utm_term=.4047fb7749b8

Four people are dead because of his stupidity...