- Is named for Viet Cong resistance leader Nguyen Van Troi and Irish revolutionary Jeremiah O'Donovan Rossa. Garity is his paternal grandmother's maiden name. Changed his name to Troy when he started acting.
- Had an unbilled role in his mother (Jane Fonda) and grandfather's (Henry Fonda) 1981 film On Golden Pond.
- As a teen, ran away with the circus when he became infatuated with one of the performers.
- Is involved with two gang-violence-prevention groups.
- Portrayed his father, activist Tom Hayden, a member of the Chicago Seven, in the 2000 Abbie Hoffman biopic Steal This Movie.
- 2004, Golden Globe — Best Performance by an Actor in a Miniseries or Motion Picture Made for Television: Nominee
- Mary Williams — Sister
- Simone Bent — Wife
- Vanessa Vadim — Half Sister
- Bridget Fonda — Cousin
- Justin Fonda — Cousin
- Peter Fonda — Uncle
- Jane Fonda — Mother
- Frances Ford Seymour — Grandmother
- Susan Brewer — Aunt
- Henry Fonda — Grandfather
- Tom Hayden — Father
- Attended University of Colorado, Boulder, Colo.
Season 1, Episode 6
- Birth Name: Troi O'Donovan Hayden
- Birth Place: Los Angeles, CA
- Birthday: July 7, 1973, Cancer
- Profession: Actor
- User Rating:
- Your Rating: