- 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, Independent Spirit Awards — Best Supporting Male: Nominee
- 2004, Golden Globe — Best Performance by an Actor in a Miniseries or Motion Picture Made for Television: Nominee
- Jane Fonda — Mother
- Justin Fonda — Cousin
- Tom Hayden — Father
- Simone Bent — Wife
- Vanessa Vadim — Half Sister
- Bridget Fonda — Cousin
- Henry Fonda — Grandfather
- Mary Williams — Sister
- Frances Ford Seymour — Grandmother
- Susan Brewer — Aunt
- Peter Fonda — Uncle
- Attended University of Colorado, Boulder, Colorado, United States
- Birth Name: Troi O'Donovan Hayden
- Birth Place: Los Angeles, California, United States
- Profession: Actor
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