Following the announcement that ABC is developing a spinoff of medical drama Grey’s Anatomy, the network has cast Taye Diggs in the potential spinoff.

Grey’s Anatomy will feature an upcoming two-hour backdoor pilot in May that will center on Kate Walsh’s Dr. Addison Shepherd. The plot will revolve around Addison deciding whether to leave Seattle Grace Hospital. If ABC decides to pick up the potential spinoff series, Grey’s fans will have to say goodbye to the former Mrs. McDreamy.

No details were immediately available on what character Taye Diggs, last seen in ABC’s failed drama Day Break, will play or what his involvement will be in the two-hour backdoor pilot.

The as-yet-untitled Grey’s spinoff will be in contention for a slot on the 2007-08 schedule and will be written by Grey’s creator/executive producer Shonda Rhimes, whose other drama pilot this season — about female journalists — has been pushed back to a summer production start, but it too is still up for possible series pickup.

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Jace is an LA-based television development and acquisitions junior exec who watches way too much television for his own good and would love a TiVo for every room in the house. (He’s halfway there.) His blog, Televisionary, can be found at televisionary.blogspot.com.