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At long last, we're going to find out who the murderer is in the Season 3 finale of "Devious Maids" (7 p.m., Lifetime).

And the maids put their own lives in danger trying to uncover the truth.

Elsewhere on TV ...

"Bachelor In Paradise" (7 p.m., ABC/Ch. 4): Mikey and Juelia go on a date; Joe confronts Samantha; Kirk surprises Carly.

"American Ninja Warrior" (7 p.m., NBC/Ch. 5): The season's best runs are spotlighted.

"So You Think You Can Dance" (7 p.m., Fox/Ch. 13): The remaining eight contestants — including Utahn Hailee Payne — perform; at least two are eliminated.

"Penn & Teller: Fool Us" (7 p.m., CW/Ch. 30): Magicians Blake Vogt, Joshua Jay, Levent and Ben Seidman try to fool the hosts.

"Devious Maids" (7 p.m., Lifetime): Season 3 ends with the maids putting their own lives at risk to unmask a killer.

"Whose Line Is It Anyway?" (8 p.m., CW/Ch. 30): Brad Sherwood is the guest.

"Murder In the First" (8 and 9 p.m., TNT): The trial of Dustin Maker reaches a climactic verdict.

"Significant Mother" (8:30 p.m., CW/Ch. 30): Nate accidentally ingests pot-laced gummy bears prior to an interview with a major food blogger.

"The Whispers" (9 p.m., ABC/Ch. 4): Drill takes over one of the children — but no one knows which one.

"Switched at Birth" (9 p.m., ABC Family): Bay is left heartbroken by her breakup with Emmett.

"Chasing Life" (10 p.m., ABC Family): A distraught April tries to disengage from the world in the wake of her loss.

"Teen Wolf" (11 p.m., MTV): Scott and the pack face another huge threat.