Is Amanda Knox innocent or guilty? And how many of us really care? For those who haven’t heard, Knox was a American college student studying abroad in Perugia, Italy, when arrested and convicted for the gruesome 2007 murder of a roommate. Her conviction was later overturned by an Italian court, and she’s the subject of an hourlong interview on tonight’s “20/20” (9 p.m., ABC).

For those who can’t get enough, there’s also “Amanda Knox: The Untold Story” on “48 Hours on ID” (5 p.m.).

The Knox murder trial sparked a tabloid war in Italy and the United Kingdom, two places not known for media restraint. She was painted as a decadent pot-smoking American and her hometown of Seattle was even dragged into the tabloid mix.

Knox’s story has already been turned into a Lifetime movie starring Hayden Panettiere (“Nashville”). And stories like hers are a regular staple of “Locked Up Abroad” on National Geographic. Knox’s post-trial (or between-trial, if Italian authorities have their way — her acquittal was itself overturned last month, and a retrial ordered) memoir is just out from Harper. It’s called “Waiting to Be Heard.” The real question is: how many people are waiting to listen?

Tonight’s other highlights

• “The Voice” (7 p.m., NBC) expands to two hours.

• On two helpings of “Deadliest Catch” (Discovery), Elliot’s new boat (7 p.m.), deceit (8 p.m.).

• Steak night on “Hell’s Kitchen” (7 p.m., Fox).

• Director Martin Scorsese tips his hat to Alfred Hitchcock in the 2010 mystery “Shutter Island” (7 p.m., G4), starring Leonardo DiCaprio and Mark Ruffalo.

• Somebody goes home on “Dancing With the Stars” (8 p.m., ABC).

• Two international flights get too close for comfort on “Airport 24/7: Miami” (8 p.m., Travel).

• Murder on the hard boards on “Golden Boy” (9 p.m., CBS).

• Strange doings disturb the dairy cows on “Grimm” (9 p.m., NBC). This fantasy moves to Tuesdays, replacing “Ready for Love,” which was not ready for prime time.

• “Frontline” (9 p.m., PBS) presents “Never Forget to Lie,” the story of a Holocaust survivor who revisits Poland.

• “The Little Couple” (9 p.m., TLC) enter season six in search of adoption.