WATCH THIS:

  • "Pretty Little Liars" (8 p.m., ABC Family): After the latest "accident," a frazzled Ali (Sasha Pieterse) considers leaving town for good. But her pals are determined to keep her safe in Rosewood.

  • "Frontline" (10 p.m., PBS): A new installment called "Separate and Unequal" looks at the effort by some residents in Baton Rouge, Louisiana, to form a new and better school district -- one that would be mostly affluent and white.

  • "Perception" (10:01 p.m., TNT): A famous neuroscientist is found dead, and Pierce and Moretti (Eric McCormack, Rachael Leigh Cook) must determine how the killer infiltrated the victim's impenetrable study to commit the murder.

    Also on Tuesday:

  • "Extreme Weight Loss" (8 p.m., ABC)

  • "America's Got Talent" (8 p.m., NBC)

  • "History Detectives Special Investigations" (9 p.m., PBS)

  • "Deadliest Catch" (9 p.m., Discovery)

  • "The Will Wheaton Project" (9 p.m., Syfy)

  • "Rizzoli & Isles" (9 p.m., TNT)

  • "Royal Pains" (9 p.m., USA)

  • "Celebrity Wife Swap" (10 p.m., ABC)

  • "Drunk History" (10 p.m., Comedy Central)

  • "Finding Carter" (10 p.m., MTV)

  • "Tyrant" (10 p.m., FX)

  • "The Night Shift" (10:01 p.m., NBC)

    Contact Chuck Barney at Facebook.com/BayAreaNewsGroup.ChuckBarney, or Twitter.com/chuckbarney



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