Joanna Cassidy Joanna Cassidy

After rumored to be making an appearance for the past several seasons, the mother of Seeley Booth (David Boreanaz) will finally make her appearance in Bones' season finale. Joanna Cassidy, who has also played mama (or mama-in-law) on Six Feet Under, Body of Proof and Hawthorne, has been cast in the pivotal role of Marianne Booth.

As show fans know, Booth's mother abandoned her son 24 years ago. She now unexpectedly reappears in his life at an inopportune time.

Bones' season finale is set to air Mon., April 29 on Fox.

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