- Son of Gwen Verdon
- Stepson of Bob Fosse.
- Sister Nicole Fosse was six days old when Henaghan turned twenty years old. Their mother actress and dancer Gwen Verson had her only two children when she was 18 and 38.
- Older half-brother of Nicole Fosse.
- Owns a plumbing store in Encino, California, USA. (1998)
- He is an actor and writer, known for The Christmas Kid (1967), Batman (1966) and Combat! (1962).
A very private person, little is known about his career or personal life.
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