In 2012 the group announced that they were returning to the studio to begin work on their third release. On February 9, the announcement of Shayley Bourget's departure from the band was released to the public via Facebook and YouTube.[37] Shayley had also released a video statement on YouTube, stating the reasons he had to discontinue with the band. He suffered from depression and alcoholism, along with other personal problems, and felt that he was bringing the other band members down. Shayley stated he will not be returning to the band, has since started a new project called Dayshell, with Raul Martinez, and he is continuing on with creating new music for himself. On March 2, the band announced via Facebook that Austin Carlile would be taking over on all vocals for Of Mice & Men's third studio album.[38]
A reissue of The Flood was released on July 24, 2012. It contains 2 discs, featuring 4 brand new tracks.
For Vans Warped Tour 2012, Aaron Pauley of Jamie's Elsewhere substituted on bass guitar and clean vocals. Pauley has since stated that he is no longer a band member of Jamie's Elsewhere, but he did not leave on bad terms.