David Cassidy: The Last Session (9 p.m., A&E) — A two-hour special exploring the life of former teen star David Cassidy during his final days, including never-before-heard audio tapes from 1976 and a raw and poignantly filmed final recording session. In this sad but fascinating film, Cassidy admits to producers that he lied about having dementia, confirming that his public episodes of slurred speech and forgetting words to songs were due his battle with alcoholism. Cassidy died of liver failure in November 2017.
Also on . . .
Bachelorette (8 p.m., ABC) — There will be blood. One bachelor has an accident, and later on a one-on-one date, Becca and her date are serenaded by Richard Marx.
Dietland (9 p.m., AMC) — In the third episode of this excellent new series (the first two aired back-to-back in last week’s series premiere), Plum goes through withdrawals as she works on her new writing assignment. Meanwhile, Jennifer rampages, leaving the country a fearful, bloody mess.
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Who Do You Think You Are? (9 p.m., TLC) — Actress Molly Shannon goes to Ireland in search of her mother’s unknown family tree.