Ep 9. The Redshirt

The Mentalist season 4 episode 9, titled "The Redshirt," follows the California Bureau of Investigation (CBI) team as they investigate the murder of a young woman who was a member of a local roller derby team. Jane is intrigued by the case and reveals to the team that he used to play roller derby himself, much to their surprise.

As the team delves deeper into the investigation, they discover that the victim had a lot of secrets and was involved in some illegal activities. They suspect that her murder may have been related to her involvement in these activities, but they can't seem to find any concrete evidence to support their theory.

Meanwhile, Jane is convinced that the killer is someone from the victim's roller derby team, and he goes undercover as a new member of the team to try and uncover more information. He quickly becomes close to the team and begins to learn more about their world. Through his undercover work, Jane is able to uncover some key information that helps the team get closer to finding the killer.

As the investigation heats up, the CBI team must work quickly to catch the killer before they strike again. With Jane's unique insight and the team's determination, they are able to unravel the mystery and bring the killer to justice.

Overall, "The Redshirt" is a gripping episode that keeps viewers on the edge of their seats. It's packed with action, suspense, and even a bit of humor. Fans of the series will appreciate the team's chemistry and the way they work together to solve the case. And, of course, Jane's roller derby past adds a fun and unexpected element to the story.