"The Killing" has cast Peter Sarsgaard in his first regular TV role, EW reports.

He'll play Tom Seward, who is described as “a death row inmate for whom the clock is ticking down. A lifelong convict born into poverty and crime, Seward’s been in and out of the system for violent crimes since he was 10. Not ever wanting to appear weak, every interaction is a challenge, and one he must dominate.”

He joins previously cast Elias Koteas and Max Fowler for the AMC series' third season, alongside returning stars Joel Kinnaman and Mireille Enos.

In other casting news ...

Amy Seimetz also joins "The Killing." The multi-hyphenate indie movie actress has been cast in a regular role as Danielle Lutz, "a hard-living, financially strapped single mother whose 14-year-old daughter goes missing." [TVLine]

Sienna Guillory boards "Luther." The "Resident Evil" actress will play Mary, Idris Elba's love interest in the British drama's third season. [BBC]

Dean Winters returns to "Law & Order: SVU." The actor's character, Brian Cassidy, will appear in a March episode "to testify in the case against Bart Ganzel (Peter Jacobson), the pimp who tried to have him killed earlier in the year." Unfortunately for Cassidy, he soon becomes the center of his own investigation after being accused of rape. [Give Me My Remote]

"Mad Men" alumna visits "Castle." Cara Buono will play Siobhan O’Doul, a bar owner who has become entangled with the Staten Island Mafia and has history with Detective Ryan (Seamus Dever). [TVLine]

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