Prepare to meet Agent Lisbon's two brothers on The Mentalist.

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Lisbon's (Robin Tunney) siblings will find themselves connected to a murder, and it's up to the FBI agent to figure out what's really going on.

Jimmy, the younger of the two brothers, will be in his early 30s, according to TV Line. A witness to a murder, Jimmy will drop off the radar and older brother Stan may know a thing or two about his disappearing act.

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Drawn into investigation on a personal and professional level, Lisbon will have a chance to introduce her new beau to her family. With her father and mother dead, Stan and Jimmy are the only ones left to weigh in on Patrick Jane (Simon Baker).

It is currently unknown who will play either brother.

Find out whether or not Lisbon can track down her brother - and if he is truly on a witness - when The Mentalist returns to CBS for a final season in 2015. Click the video below to see the final moments of the season 6 finale, "Blue Bird."

Tags: The Mentalist CBS television