The western The Big Sky (1952) was one of his biggest influences to get into film as a young man.
Spent four and a half months in Miami's Dade County Jail at age 17 for being an accomplice to a vehicle theft and alluding police in a car chase (the man driving, and guilty of the crime, was a person that had picked him up hitchhiking). Also spent a short stint in a Tucson, Arizona, jail for vagrancy in 1960.
In addition to having faced off against lethal aliens in the "Alien" and "Predator" films, he has also appeared in a film about more benevolent aliens: Close Encounters of the Third Kind (1977).
Was considered for the title role in The Terminator (1984), but was ruled out when it was decided that Arnold Schwarzenegger (who was reading for the role of Kyle Reese) would be the perfect choice as the Terminator.
Has had at least two franchise characters written for him over the years. James Cameron originally wrote The Terminator (1984) character with him in mind, as did Victor Salva with the Creeper from the Jeepers Creepers (2001) movies.
He was James Cameron's original choice for the title role in The Terminator (1984) when the concept was for a machine that could blend into a crowd. Cameron had even made concept drawings of Henriksen as the Terminator. When the concept was changed, and Arnold Schwarzenegger was cast, Henriksen was re-cast as Det. Vukovich. When Cameron made Aliens (1986), he cast Henriksen as Bishop, an android.
The part of Frank Black in "Millennium" (1996/I) was written with him in mind.
Daughters: Sage Ariel (12 October 1999), Alcamy (b. 1987).
His daughter, Sage Ariel Henriksen, was born on October 12, 1999.
There was talk of having him reprise his role as Detective Vukovich in Terminator 3: Rise of the Machines (2003). The idea was to have his character bound in a wheelchair (after having survived the events of the original film). That idea, however, was eventually rejected.
He was walking through a hotel lobby in Romania (where he was wrapping up another film) when he was offered One Point O (2004).