The Mentalist Casting Spoilers: 24 Actress Checks In

The Mentalist Casting Spoilers: 24 Actress Checks In

The Mentalist tapped 24 alumna Mary Lynn Rajskub for a guest starring role, TV Line reports.

The actress will guest star as a rehab patient whose roommate is murdered in a January episode of the CBS procedural.

'The Mentalist' airs every Sunday on CBS.