Dr. Tara Elizabeth Lewis is a fictional character in the CBS crime drama Criminal Minds, portrayed by Aisha Tyler. Lewis is a forensic psychologist and a Supervisory Special Agent of the FBI's Behavioral Analysis Unit. Lewis first appeared in "The Job", serving as a temporary replacement for Agents Kate Callahan (Jennifer Love Hewitt) and Jennifer Jareau (A.J. Cook) while they were both on maternity leave. Aisha Tyler was slated to appear in only the first six episodes of Season 11 but the producers "loved her so much" that they extended her role. She then appeared in 18 episodes that season. Tyler was then promoted to series regular in Season 12. From Wikipedia
