The 2009 murder of NFL quarterback Steve “Air” McNair and the questions surrounding it are re-examined in the latest season of the sports documentary anthology “Untold” (Netflix, streaming), where future stories in season four will be “Sign Stealer” next week, and “Hope Solo vs. U.S. Soccer on Sept. 3.  

Speaking of 2009, the man inaugurated as 44th President of the United States that year, Barack Obama, is the featured speaker tonight at the energetic Democratic National Convention  (PBS, CNN, CSPAN, MSNBC, 8 p.m.; ABC, CBS, NBC, 10 p.m.), where an even more popular speaker may be his wife, the bestselling author Michelle Obama. Also on the bill tonight, First Gentleman Doug Emhoff and the ceremonial roll call of the states’ delegations. Pro tip: Watching on CSPAN is the best way to catch all the coverage; even the cable news networks ignore what’s happening on the Dias so that panels can jabber maddeningly on. 

In less important voting, “America’s Got Talent” (NBC, 8 p.m.) continues live quarterfinals. 

From Thailand comes the new eight-episode horror anthology, “Terror Tuesday; Extreme” (Netflix, streaming), featuring stories inspired by the “Angolan Khlumpong” radio show. 

It sounds like a political show, but “Divided by Design” (HGTV, 9 p.m.) is a new show that pits design firms against one another in the Miami housing market. 

“Celebrity Family Feud” (ABC, 8 p.m.) features WWE stars. Other game shows tonight include “Beat Shazam” (Fox, 8 p.m.) and “The Quiz with Balls” (Fox, 9 p.m.).

A student’s life is put in danger on “The Michael Blazon Show” (BET, 10 p.m.).

On “Tyler Perry’s House of Payne” (BET, 8 p.m.), a new member of the social club seems suspect.

Leah wants to try for another baby on “Tyler Perry’s Assisted Living” (BET, 9:30 p.m.). 

“The Real Housewives of Dubai” (Bravo, 9 p.m.) return home from Bali. 

Sig figures out a way to fish faster on “Deadliest Catch” (Discovery, 8 p.m.).

“Hard Knocks: Training Camp with the Chicago Bears” (HBO, 9 p.m.) continues to work out at Lake Forest, Ill. 

A home invasion has Spice questioning her safety on “Love & Hip Hop: Atlanta” (MTV, 8 p.m.). 

“The Surreal Life” (MTV, 9 p.m.) goes to a spiritual retreat.

Phillies pitcher Aaron Nola is guest “On Base with Mookie Betts” (TBS, 10:30 p.m.).

“Welcome to Plathville” (TLC, 10 p.m.) runs its Spartan Race.

Whitney’s 40th birthday approaches on “My Big Fat Fabulous Life” (TLC, 9 p.m.).

Turner Classic Movies’ Summer Under the Stars features actress Jeanne Crain in “Skyjacked” (6 a.m.), “Guns of the Timberland” (8 p.m.), “The Fastest Gun Alive” (9:30 p.m.), “Gentleman Marry Brunettes” (11:30 a.m.), “The Tattered Dress” (1 p.m.), “State Fair” (2:30 p.m.), “A Letter to Three Wives” (4 p.m.), “Pinky” (6:15 p.m.), “Margie” (8 p.m.), “The Model and the Marriage Broker” (10 p.m.), “People Will Talk” (midnight) and “Twenty Plus Two” (2:15 a.m.). 

Baseball includes Philadelphia at Atlanta (TBS, 7 p.m.) and Seattle at Dodgers (MLB, 10:10 p.m.).

WNBA action includes Dallas at New York (NBA, 7 p.m.).

Daytime Talk

Kelly Ripa and Mark Consuelos: Naomi Watts, Vivica A. Fox, Chrissy Teigen, Dr. Melina Jampolis. The View: Busta Rhymes, Caroline Wanga, Judy Gołd (rerun). Drew Barrymore: Jason Momoa, Gracie Abrams (rerun). Kelly Clarkson: Jon Bon Jovi, Jennifer Esposito, cast of “The Outsiders” (rerun). Jennifer Hudson: Babyface (rerun). Tamron Hall: Luann de Lesseps, Jonathan Cheban, Zoe Grinfield (rerun). 

Late Talk

Stephen Colbert: Rep. Nancy Pelosi, Rep. Hakeem Jeffries. Jimmy Kimmel: Colman Domingo, Sanaa Lathan, KALEO, RuPaul. Jimmy Fallon: Adam Sandler, will.i.am, Liz Moore, Julia McCullough. Seth Meyers: Michael Keaton, Conner O’Malley. Taylor Tomlinson: Richie Moriarty, Betsy Sodaro, Punam Patel (rerun). Daily Show: Rep. Lauren Underwood.