Here's the official guide of The Mentalist season 5 episode 19 "Red Letter Day". This episode airs on Sunday, April 14 on CBS.
THE CBI TEAM HEADS TO A RUN-DOWN WILD WEST TOURIST TOWN WHEN THE OWNER IS FOUND DEAD --
- The CSI team heads out to a run-down Wild West tourist town when the owner is found dead.
- Meanwhile, Kirkland tries to find out how much Jane knows about Red John.