An autopsy report obtained by People revealed Garrison died from a gunshot wound to the head. His death has been ruled a suicide. The report also documented ethanol intoxication as a contributing factor to his death, with Garrison's blood alcohol level being recorded at .307 percent, which is significantly higher than the legal limit of .08 percent (in the U.S.). Traces of caffeine were also found in his system, per People.

Sadly, Garrison's brother Gabriel is reportedly the one who found him.

Janelle confirmed the sad news of Garrison's passing on Instagram, writing, "Kody and I are deeply saddened to announce the loss of our beautiful boy Robert Garrison Brown. He was a bright spot in the lives of all who knew him. His loss will leave such a big hole in our lives that it takes our breath away. We ask that you please respect our privacy and join us in honoring his memory."