Casting announcements were made in December, 2010, with the rest of the main cast being Crystal Reed, Holland Roden and Colton Haynes playing Allison Argent, Lydia Martin and Jackson Whittemore respectively. Haynes left the series after the second season to work on Arrow. He returned in the second part of the sixth season as a guest star. Reed followed, leaving after the third season to pursue other projects. She returned to guest star in the second part of Season 5 and played one of Allison's ancestors. Arden Cho, Shelley Hennig, and Dylan Sprayberry joined the cast for Seasons 4 and 5. Tyler Hoechlin left the series after the fourth season. Hoechlin later returned to the show in the second part of the sixth season in a guest capacity. On April 11, 2016, Arden Cho announced that she would not be returning for Season 6. After appearing in a recurring capacity in the first five seasons, Linden Ashby, Melissa Ponzio and J. R. Bourne were all upgraded to series regulars for the final season.