- She married Colm O'Kelly, a stage manager and actor. Not long afterward, the company went to Egypt on tour. O'Kelly went swimming in the Nile, contracted polio, and died. They had been married less than a year. Manahan never remarried.
- Successfully treated for a heart ailment in New York.
- Won Broadway's 1998 Tony Award as Best Actress (Featured Role - Play) for "The Beauty Queen on Leenane." Her previous, and only other Tony nomination was 29 years earlier, in 1969, in the equivalent category of Best Supporting or Featured Actress (Dramatic) for Brian Friel's "Lovers."
- Cousin of actress Sheila Manahan
- Has two surviving brothers named Val and Joe.
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