Plot summary
Ellis Mars, a local astrologer, helps Patrick solve a triple murder involving two policemen and an EMT's fiancée. The case expands to several previous policemen murders, and forces the killer to break his normal full moon killing cycle to keep from being exposed. While the local police believe it was Mars who was the killer, Patrick realises it was the seemingly-livid and distraught EMT himself, Todd Johnson. After his arrest, Patrick arrives at Johnson's cell at his request, only to find Johnson in flames. Johnson later dies from his injuries, but not before whispering the first verse of The Tyger, revealing Red John was involved in Johnson's activities and death.
Credits
Adapted from Wikipedia contributors, The Mentalist season 3. HTML formatting and reference markers removed.