SEASON FINALE

SARAH DISCOVERS ANOTHER DEVASTATING SECRET THAT WILLIAM WALKER HAS KEPT FROM THE FAMILY, ON THE SEASON FINALE OF ABC'S "BROTHERS & SISTERS"

"Prior Commitments" � Kevin and Scotty make a commitment to be life partners, Saul finally deals with his identity in a public way, and the family discovers that William (guest starring Tom Skerritt) kept yet another painful secret from his family, on the season finale of "Brothers & Sisters," SUNDAY, MAY 11 (10:02-11:00 p.m., ET), on the ABC Television Network.

"Brothers & Sisters" stars Dave Annable as Justin Walker, Maxwell Perry Cotton as Cooper Whedon, Kerris Lilla Dorsey as Paige, Sally Field as Nora Holden, Calista Flockhart as Kitty Walker, Balthazar Getty as Thomas Walker, Rachel Griffiths as Sarah Whedon, Rob Lowe as Senator Robert McCallister, Sarah Jane Morris as Julia Walker, Matthew Rhys as Kevin Walker, Ron Rifkin as Saul Holden, Emily VanCamp as Rebecca Harper and Patricia Wettig as Holly Harper.

Guest starring are Tom Skerritt as William Walker, Luke MacFarlane as Scotty Wandell, Michael Adler as Doug Manning, Michael O'Keefe as Wally Wandell, Jayne Brook as Bertha Wandell and Parvesh Cheena as Jordan.

"Prior Commitments" was written by Greg Berlanti, Monica Owusu-Breen and Alison Schapker and directed by Ken Olin.

"Brothers & Sisters" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1-channel surround sound and Spanish subtitles via secondary closed captioning. A TV parental guideline will be posted closer to airdate.

This episode of "Brothers & Sisters" will be available on ABC.com the day after airing on the network for users to watch online. Also, check out the new weekly video blog, "Brothers & Sisters: Writers Room" on ABC.com, which will give online viewers an exclusive look inside the series from the show's writers.