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In the two-hour, third-season premiere of The Killing (Sunday, 6 and 9:05 p.m., AMC), Sarah is pulled back in to help investigate a serial-killer case.Not everyone is a fan of this show, but I am. Despite the fact that I'm not a big fan of serial-killer dramas.Elsewhere on Friday ...What Would You Do? (8 p.m., ABC/Ch.4): The series returns for a summer run.Treehouse Masters (8 and 10 p.m., Animal Planet): New series about guys who build amazing treehouses.Merlin (8 and 10 p.m., Syfy): Merlin faces his moment of destiny. (Season finale)Elsewhere on Saturday ...Triple A baseball (7 p.m., Ch. 14): Colorado Springs Sky Sox at Salt Lake BeesOrphan Black (7 and 10 p.m., BBC America): The Orphans must decide whether to make peace with their creators. (Season finale)MLS (7:30 p.m., Ch. 4): San Jose Earthquakes at Real Salt LakeElsewhere on Sunday ... Army Wives (7 and 11 p.m., Lifetime): Gloria agrees to go out with Hector.The Women's Concert for Change: Live From London (8 p.m., NBC/Ch. 5): Scheduled performers include Beyoncé, Ellie Goulding, Florence and the Machine, Jay-Z, Jennifer Lopez, John Legend and Timbaland.Mad Men (8 and 11:05 p.m., AMC): The agency has to scramble to hang onto a client.Top Hooker (8 and 10 p.m., Animal Planet): Oh, get your mind out of the gutter! This is a fishing competition show.The Client List (8 p.m., Lifetime): Evan and Trimble go under cover in a massage parlor.Food Network Star (10 p.m., Food Network): A new season begins, and Salt Laker Viet Pham is among the contestants.Game of Thrones (10 p.m., HBO): Robb tries to win over the Freys; Jon faces a tough test; Bran discovers a new gift.Veep (11 p.m., HBO): Someone leaks a damaging story about Selina's ex-husband.The Borgias (11 p.m., Showtime): Micheletto discovers his lover is a spy.Family Tree (11:30 p.m., HBO): Tom seeks information about the life of his grandfather.