8 p.m. on FAM, “Switched at Birth” — New episodes resume with ‘‘Mother and Child Divided,’’ in which Regina (Constance Marie) returns home from rehab early in hopes of spending more time with Daphne (Katie Leclerc). She discovers, to her dismay, that the girl has gotten closer to the Kennishes in her absence. Bay (Vanessa Marano) runs into her ex-boyfriend Ty (Blair Redford), who’s back from Afghanistan. Sean Berdy and Ryan Lane also star.

9 p.m. on BRAVO, “The Real Housewives of Orange County” — As Tamra’s bachelorette celebration in Mexico continues, Vickie spirits Tamra and Lydia away for a night of drinking, which angers Heather and Gretchen and leads to a dramatic poolside confrontation. Tamra drops a bombshell about her past on Gretchen. Back in Orange County, Alexis wants something from Jim that he’s not willing to give her in the new episode ‘‘Dirty Dancing in Mexico.’’

10 p.m. on 6, “Hawaii Five-0” — McGarrett (Alex O’Loughlin) and the team investigate the murder of a college professor, focusing on three suspects: the man’s boss, his teaching assistant and a cheating student. A federal witness whom Kono (Grace Park) is protecting escapes from custody in ‘‘Kapu,’’ Hawaiian for ‘‘forbidden.’’ Scott Caan also stars.

10:01 p.m. on 2, 9, ‘‘Mistresses’’ — Savi (Alyssa Milano) gets very different advice from Karen and April (Yunjin Kim, Rochelle Aytes) on whether to come clean to Harry (Brett Tucker) about her night with Dominic (Jason George). April investigates a woman’s claim that her late husband, Paul, had another life. Joss (Jes Macallan) befriends a new client (Shannyn Sossamon) in the new episode ‘‘The Morning After.’’

11 p.m. on COM, “The Daily Show With Jon Stewart” — John Oliver takes over as guest host starting tonight, while Stewart takes an eight-week leave from the show to direct his first feature film, ‘‘Rosewater.’’ A ‘‘Daily Show’’ mainstay since 2006, Oliver reassures fans that the show won’t suffer a bit: ‘‘Don’t worry, it’s still going to be everything that you love about ‘The Daily Show,’ just without the thing that you love the most about it.’’ Seth Rogen is scheduled to be Oliver’s guest tonight.