Alexander was last seen with his father, Thomas Riffenburg on January 9, 2009. Alexander and his mother, Jennifer Anne Walsh, disappeared and neither of them has been seen or heard from since. Thomas Riffenburg confessed to their murders in 2017 but Alexander has not been located.
Los Angeles Police Department Missing Persons Unit: 1-213-996-1800
National Center for Missing & Exploited Children: 1-800-843-5678