NCIS An unconventional investigation ensues after a deep-sea diver is murdered on the job, which means his corpse — and all of the suspects — must remain together in a high-tech decompression chamber for four days. 8 p.m. CBS
Finding Your Roots Military service is the theme of this new episode featuring Sen. John McCain (R-Ariz.), Julianne Moore and Patricia Arquette. 8 p.m. KOCE and KPBS
Pretty Little Liars Sara Harvey (Dre Davis) is suspected to be behind the new threats, but there's not enough evidence to go to the police. 8 and 10 p.m. Freeform
NCIS: New Orleans Pride...