Jenni Baird has joined the cast of USA Network's drama series "The 4400" as a regular. She will play a new authority figure who has a relationship with Tom Baldwin (Joel Gretsch). Australian-born Baird is repped by ICM and manager Michael Levine. … Rockmond Dunbar has been tapped to co-star on TNT's upcoming series "Heartland," a heart surgeon drama starring Treat Williams. Dunbar will play Tom Jonas. Dunbar, who co-starred on Fox's "Prison Break," is repped by APA and manager Evan Hainey at Untitled Entertainment. … Krysten Ritter (the CW's "Gilmore Girls") has joined the cast of the Fox comedy " 'Til Death" as a recurring. She will reprise her role as Brad Garrett and Joely Fisher's daughter, which she originated in a guest appearance Dec. 21. Ritter, whose series credits also include the CW's "Veronica Mars," is repped by Innovative Artists and manager Kyle Luker of the Group Entertainment. … Pamela Adlon has landed a multiepisode arc on Fox's upcoming series "The Wedding Bells" and a potentially recurring role on Showtime's untitled Tom Kapinos pilot. On "Bells," she will play a runaway bride. In the Showtime pilot, she will play a friend of the central character, played by David Duchovny. Adlon, a voice cast member of Fox's "King of the Hill," recently starred on HBO's "Lucky Louie." She is repped by APA and Meghan Schumacher Management. … Tim Guinee has joined the cast of Fox's pilot "The Sarah Connor Chronicles" as a potential recurring. He will play a former love of Connor (Lena Headey). Guinee, recently seen on the Sci Fi Channel series "Stargate SG-1," is repped by Innovative Artists and manager Larry Taube and Sue Liebman. … Katherine Helmond ("Everybody Loves Raymond"), Richard Libertini ("Awakenings"), Jamie Farr ("M*A*S*H") and Juliette Goglia ("Cheaper by the Dozen 2") have joined Ernest Borgnine in the Hallmark Channel original movie "Bert & Becca," which recently began production in and around Los Angeles. The movie centers on Bert (Borgnine), a former song and dance man who has been estranged from his family for 10 years. When his daughter is injured in an automobile crash, he becomes the guardian of his 9-year-old granddaughter (Goglia), who he has never met. The movie is set to air in December. … Raymond Ochoa has joined the cast of ABC's comedy pilot "American Family" as the youngest Bogner child. He is repped by Origin Talent Agency and Talent Ink LA/NY Management. … Alicia Ziegler has joined the cast of ABC Family's drama series "Wildfire" as a recurring. She will play an Ivy League law student. Ziegler is repped by Amsel, Eisenstadt & Frazier and Impact Artists Group. … Frank Grillo has joined Spike TV's upcoming series "The Kill Pit," about a bank heist gone wrong. Grillo will play one of the robbers. Grillo, whose series credits include ABC's "Blind Justice" and Fox's "Prison Break," next will be seen in the feature "Pride and Glory." He is repped by Innovative Artists and Brillstein-Grey.