Fox’s Bones spinoff just added a BIG cast member.

Michael Clarke Duncan has been tapped to co-star in the project, which will be introduced in the 19th episode of Bones this season (tomorrow night's is just the 10th).

The Bones spinoff, based on The Locator books by Richard Greener, centers on Walter Sherman (a.k.a. "The Locator"), a former military policeman who can find anything.

Michael Clarke Duncan is coming to Bones this spring.

That role is still being cast. Duncan will portray Leo, Walter’s partner. He's described as "a rawhide cowboy philosopher," a talented eccentric who meshes with Bones.

This would mark the first regular TV gig for the 53-year-old Duncan, who is probably best known for his Oscar-nominated role as John Coffey in The Green Mile.

Thoughts on Duncan's casting, and/or who should play The Locator? Share!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.