A new episode of “20/20” looks at the life and legacy of John Lennon, 40 years after his murder in New York.

Tonight: 20/20 (9 p.m., ABC)

In its Season 43 premiere, “20/20” tells the story of the life and lasting legacy of John Lennon.

ABC News tracks his final days and interviews friends and colleagues, including legendary rock photographer Bob Gruen, record producer Jack Douglas, and close friend and publicist Elliot Mintz. The two-hour program also includes the last interview John did the day he died and interviews with the radio reporters who conducted it. Rarely seen ABC News archival footage is also shown.

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