From The Hollywood Reporter:
Clarence Williams III, who starred as the brooding undercover cop Lincoln Hayes on the countercultural 1968-73 ABC drama The Mod Squad, has died. He was 81.
Williams died in Los Angeles on Friday June 4, 2021 of colon cancer, his management confirmed to The Hollywood Reporter.
An actor of uncommon intensity, Williams began his career on the stage and earned a Tony nomination in 1965 for best featured actor in a play for his work in the powerful three-person drama Slow Dance on the Killing Ground. Decades later, he returned to Broadway to star opposite Maggie Smith in the original 1979 production Tom Stoppard’s Night and Day.

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Clarence Williams III Dead: ‘Mod Squad’ Actor Was 81 – The Hollywood Reporter