Nenna's (Tracy Ifeachor) escape plan puts Lowe (Richard Coyle) in jeopardy on “Crossbones.” (Francisco Roman/NBC)

In 2004, Ariet Girgis was brutally murdered in her gated-community home. With her son Ryan virtually unscathed and no items taken, all signs pointed to something other than a home invasion, and now “Dateline NBC” (NBC at 8 p.m.) investigates.

“Monumental Mysteries” (Travel at 9) explores one Bavarian king’s affair with a Spanish dancer, the story behind a 16-foot statue of Vladimir Lenin in Seattle and a disease that was studied by a scientist who used himself as a lab rat.

“Fashion Police” (E! at 9) brings on Jordin Sparks as a guest host and rapper Common as the musical guest.

Unsuspecting patrons grapple with a suitable response to a child drawing on art displayed in a cafe and to a waiter refusing to serve a homeless customer on “What Would You Do?” (ABC at 9).

Sorority sisters and siblings clash over a bride’s princess-style gown, and a woman falls in love with a dress far out of her price range on “Say Yes to the Dress: Atlanta” (TLC at 9 and 9:30).

Nenna’s escape plan puts Lowe in peril, and Balfour forms an unlikely alliance on “Crossbones” (NBC at 10).

“Real Time With Bill Maher” (HBO at 10) hosts a roundtable with economist Richard D. Wolff, astrophysicist Neil deGrasse Tyson, political strategist Hogan Gidley, journalist Amy Goodman and FreedomWorks chief executive Matt Kibbe.

SERIES PREMIERE: “Bride by Design” (TLC at 10) introduces us to Heidi Elnora, a custom wedding dress designer, who, with the help of her Build-a-Bride collection, has created a service for women looking to personalize their gowns. In the premiere, former Miss Tennessee, Ashley, looks to Heidi and her team to create her dream “rustic princess” dress.

Pete Nelson helps three siblings surprise their parents with a custom two-story, Scandinavian-style treehouse complete with a studio and sky tents in Wisconsin on “Treehouse Masters” (Animal Planet at 10).

Actors Jon Hamm and Brit Marling come to “The Tonight Show Starring Jimmy Fallon” (NBC at 11:35), along with homemaker extraordinaire Martha Stewart.

Actor Michael Douglas is on the “Late Show With David Letterman” (CBS at 11:35), with stand-up comedian Paul Morrissey and music from Kiesza.

“Guardians of the Galaxy” cast members Chris Pratt, Zoe Saldana, Dave Bautista, Vin Diesel and Bradley Cooper stop by “Jimmy Kimmel Live” (ABC at 11:35), with Classixx as the musical guest.

Rachel Lubitz