THE MENTALIST Season 4 Episode 20 Something’s Rotten In Redmund Photos : “Something’s Rotten In Redmund” — Jane (Simon Baker), Lisbon (Robin Tunney) and the CBI try to determine who would have reason to kill a popular English teacher. Also featured is Matt McCoy, on THE MENTALIST, Thursday, April 5 (9:00-10:00 p.m. ET/PT) on the CBS Television Network. s04e20 4×02 4.20 s4e20