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What to Watch on Tuesday: ‘This Is Us’ and the new ‘Law & Order True Crime’ on NBC

Sterling K. Brown as Randall in NBC’s “This Is Us.”
Sterling K. Brown as Randall in NBC’s “This Is Us.” Ron Batzdorff/NBC

This is Us (9 p.m., NBC) – In the second season start, Jack and Rebecca deal with the fallout of their big fight.

Also on tonight . . .

NCIS (8 p.m., CBS) – Season 15 starts with the team searching for Gibbs and McGee two months after they went missing in Paraguay. “NCIS New Orleans” starts Season 4 at 10.

Lethal Weapon (8 p.m., Fox) – Following a very strong first season, Murtaugh and Riggs pick up in Mexico, where Riggs hopes to finish off Tito Flores.

The Vietnam War (8 p.m., PBS) – In part 8, President Nixon begins withdrawing American troops from Vietnam.

Bull (9 p.m., CBS) – Bull faces off against an old romantic interest in the Season 2 opener.

The Mick (9 p.m., Fox) – Mickey and the kids are forced to downgrade their living situation in the Season 2 premiere.

Brooklyn Nine-Nine (9:30 p.m., Fox) – Jake and Rosa cope with jail in different ways in the fifth season opener.

Law & Order True Crime: The Menendez Murders (10 p.m., NBC) – This new series is based on the real life murders of Jose and Kitty Menendez by their sons Lyle and Erik in California in 1996.