Theo E.J. Wilson imagines himself in the middle of Al Capone and company during the St. Valentine’s Day Massacre on “I Was There” (History, 10 p.m.).
“9-1-1: Lone Star” (Fox, 9 p.m.) responds to a clown emergency at a young boy’s birthday party.
A shocking discovery rattles the nation on “The Endgame” (NBC, 10 p.m.).
“9-1-1” (Fox, 8 p.m.) comes to the rescue of a social media influencer who has a sauna accident.
Amara wonders what to do next when new information comes to light on “All American: Homecoming” (CW, 9 p.m.).
“Better Call Saul” (AMC, 9 p.m.) had strong ratings when it returned for its sixth season premiere last week.
Ashley goes after Gary on “Below Deck Sailing Yacht” (Bravo, 8 p.m.).
“Summer House” (Bravo, 9 p.m.) ends its season with a prom.
Desserts with cocktails, wine and cheese are the challenge on “Spring Baking Championship” (Food, 8 p.m.).
On “Celebrity IOU” (HGTV, 9 p.m.), Howie Mandel conducts a home makeover for his longtime road manager.
The Voynich Manuscript is seen as one of “History’s Greatest Mysteries” (History, 9 p.m.).
Some of the “Black Ink Crew” (VH1, 8 p.m.) goes to Milwaukee for Ted’s grand opening.
An ex-employee starts a pop-up shop on “Black Ink Crew Compton” (VH1, 9 p.m.).
On “All American” (CW, 8 p.m.), Olivia’s life gets more complicated.
The month-long Monday night tribute to Errol Flynn on Turner Classic Movies concludes with “Gentleman Jim” (8 p.m.), “Footsteps in the Dark” (10 p.m.), “Never Say Goodbye” (midnight), “That Forsyth Woman” (2 a.m.) and “The Sisters” (4 a.m.).
During the day are films about parents in prison with “The Last Gangster” (6 a.m.), “Blackmail” (7:30 a.m.), “His Greatest Gamble” (9 a.m.), “The Great O’Malley” (10:30 a.m.), “Always in My Heart” (11:45 a.m.), “House of Women” (1:30 p.m.), “Why Would I Lie?” (3 p.m.), “Man to Man” (5 p.m.) and “Going Home” (6:15 p.m.).
NBA playoffs have Boston at Brooklyn (TNT, 7 p.m.), Toronto at Philadelphia (NBA, 8 p.m.) and Utah at Dallas (TNT, 9:30 p.m.).
Hockey has Philadelphia at Chicago (Hulu, streaming, 8 p.m.).
Baseball includes Boston at Toronto (MLB, 7 p.m.) and Cleveland at Angels (MLB, 10 p.m.).
Daytime Talk
Kelly Ripa and Ryan Seacrest: Debra Messing, Eric Ripert. The View: Jesse Tyler Ferguson, Amber Ruffin. The Talk: Joan Collins. Ellen DeGeneres: Robin Roberts, Dwayne Wade. Drew Barrymore: Rosie Perez, Pamela Adlon. Kelly Clarkson: Colin Hanks, Lucy Boynton, Jewel. Tamron Hall: DJ Envy, Gia Casey, Quincy Isaiah, DeVaughn Nixon. Wendy Williams: Michael Rapaport. The Real: Judge Greg Mathis.
Late Talk
Stephen Colbert: Hannah Gadsby, Sandra Bullock, Buffalo Nichols (rerun). Jimmy Kimmel: Bill Hader, Mo Amer. Jimmy Fallon: Chrissy Teigen, Cristin Milloti, Soccer Mommy. Seth Meyers: Terry Crews, Vanessa Bayer, Sam Fender, Fred Eltringham. James Corden: Henry Winkler, Wyatt Russell, Lara Beitz.