Brooklyn Nine-Nine 9 p.m., Fox

I love seeing who gets cast as the parents of regular sitcom characters. In what has become a trend, those parents are very often played by older sitcom stars. Katey Sagal, who starred in “Married . . . With Children’’ before she became an FX anti-hero and, most recently on “The Bastard Executioner,’’ a witch, will appear on “Brooklyn Nine-Nine’’ as Andy Samberg’s character’s mother.

Murder of a President9 p.m., WGBH 2

This episode of the American Experience documentary series is a profile of the 20th US president, James A. Garfield (1831-81). He was in office only a short time: On July 2, 1881, four months after taking office, he was shot and died 79 days later.

Super Bowl’s Greatest Commercials 8 p.m., CBS

Next: A show on commercials that run during “Commercials.’’

What Would You Do? 10 p.m., ABC

Stand up and walk out on you.

Chicago Fire 10 p.m., NBC

That tornado is so over. Next up: a mass shooting.

Matthew Gilbert can be reached at gilbert@globe.com. Follow him on Twitter @MatthewGilbert.