Tonight's TV Hot List: Tuesday, July 20

Pretty Little Liars
8 pm/ET ABC FAMILY
Sara Shepherd, the author of the book series this show is based on, steps into the world she created when she guest stars as a substitute teacher. And that world continues to be full of secrets and tension as the girls deal with the ramifications of everything that occurred during last week's tumultuous homecoming dance, including something they discovered about Toby that night. Meanwhile, Aria is now getting troubling text messages from someone else in addition to "A." — Jennifer Sankowski
Deadliest Catch
9 pm/ET Discovery
Sometimes the phrase "viewer discretion is advised" means that the program in question could contain profanity, violence or something else younger viewers should perhaps not watch. Tonight we can extend that sentiment to viewers who do not feel they can handle witnessing the last moments of a real man's life as they unfold on TV. Rest in peace, Capt. Phil Harris. A special salute to the beloved skipper follows this emotional hour. — Michael Chant

Rescue Me
10 pm/ET FX
Worried about Lou? You'll know whether he survived his heart attack before the opening credits roll. But in any event...paging Dr. Franco Rivera, stat! Franco poses as a doctor in an elaborate scheme (actually, it's stupid) to keep FDNY headquarters from closing 62 Truck. Meanwhile, Damien's "sleeping with the enemy" (or hoping to) when he dates Penny (Deanna Russo), the West Side Wildmen's probie. And Janet calls Franco when she has a plumbing problem. You can imagine how Tommy interprets that. — Paul Droesch

Kathy Griffin: My Life on the D-List
10 pm/ET BRAVO
It's not uncommon for celebrities to undergo public medical tests for public-service purposes: Katie Couric's Today show colonoscopy is a prime example, and Bill Moyers had his body tested for chemicals in 2001 on PBS. Then there's Kathy Griffin. Cervical cancer is serious business, but who says you can't be brassy and vulgar (not to mention funny) while raising awareness of it. Griffin has a Pap smear in this episode — poolside and clad in a blue bikini (the top, anyhow). As she told Joy Behar (who guest stars) in April: "You're going to be mildly disgusted but hopefully amused." — Paul Droesch
Memphis Beat
10 pm/ET TNT
Dwight's got a reason to sing the blues when he investigates a pair of deaths in a famed country-music family. The group's matriarch dies, and her passing is quickly followed by another mysterious death when the manager of the group takes a deadly dive from a balcony. But was it an accident, suicide or murder? Dwight intends to find out, but bitter disharmony within the family threatens to silence his probe. Giovanni Ribisi guest stars. — Tim Holland
If You Really Knew Me
11 pm/ET MTV
Cliques are an inevitable part of high school. But what if for one day, the jock, the cheerleader, the geek and the goth put the stereotypes aside and really got to know one another? They'd probably find out that they're not so different after all. That's the premise of this worthwhile new series, which bills itself as "the reality version of 'The Breakfast Club'," and aims to break down the social barriers found in every high school. In the opener, racism on a California football team prompts a star athlete to take a stand against school-wide intolerance. — Karen Andzejewicz
Tour de France
6:30 am/ET VS
The cities hosting Stage 16 of this year's Tour de France should be fairly familiar to experienced riders, as both  Bagnères-de-Luchon and Pau have hosted the race at least 50 times over the years. As for the stage itself, cyclists will be attacking the Pyrenees mountains for a grueling 199.5km trek. — Kelly McGettigan