His recording of "I'm Easy" reached #17 on the US charts in August, 1976.
Son of John Carradine and Sonia Sorel.
Half-brother of David Carradine, Bruce Carradine and Michael Bowen.
Middle brother of Robert Carradine and Chris Carradine.
Daughter, actress Martha Plimpton, is from his relationship with Shelley Plimpton.
Uncle of actress Ever Carradine and Kansas Carradine.
Longtime girlfriend is Hayley DuMond. Met while filming Hunter's Moon (1995) with Burt Reynolds. 
Plays "Wild Bill Hickock" in Deadwood (2004) and played "Buffalo Bill Cody" in Wild Bill (1995).
Was nominated for Broadway's 1991 Tony Award as Best Actor (Musical) for playing the title character Will Rogers in "The Will Rogers Follies."
He and Hayley DuMond wed the same day as Tom Cruise and Katie Holmes celebrated their wedding in a small city near Rome.
For his role on Deadwood (2004), he was trained by renowned Hollywood Gun Coach Thell Reed, who has also trained such actors as: Val Kilmer, Kurt Russell, Sam Elliot, Girard Swan, Russell Crowe, Brad Pitt, and Leonardo DiCaprio.
Father, with Sandra Will, of a boy named Cade Carradine (b. July 19th 1982) and a girl named Sorel Carradine (b. June 18th 1985).
Following the divorce from Carradine, ex-wife Sandra Will became romantically involved with Los Angeles private eye, Anthony Pellicano, and was arrested for her involvement in placing illegal wiretaps on the unsuspecting actor's phone. She later plead guilty and received a jail sentence for the felony crime.
Daughter Martha Plimpton was conceived while Keith and actress Shelley Plimpton were appearing in the rock musical "Hair" on Broadway in 1969. Born in 1970, the relationship was over by the time Martha was born and Keith did not meet her until she was four years old.
Originally, it was his half-brother David Carradine who pursued a role in the Broadway musical "Hair" in 1969. At his audition he brought Keith along to play the piano. Keith ended up winning the part and stayed with the show for six months.
He was awarded a Star on the Hollywood Walk of Fame for Live Performance at 6233 Hollywood Boulevard in Hollywood, California.
His paternal grandmother, Genevieve Winifred Richmond, was one of the first female brain surgeons in North America.
Keith's father was of English, with distant Irish and Dutch, ancestry, and was a direct descendant of Dutch diamond merchant Kiliaen van Rensselaer, who settled in Rensselaerwyck, NY, now identified as Albany, NY. Keith's maternal great-grandfather was biochemist Max Henius, who was born in Denmark, to a Polish Jewish family. Keith's mother's other ancestry was Danish, German, and Swiss-German.
On Criminal Minds (2005) he played Frank Breitkopf, a serial killer that had been killing for 30 years. On Dexter (2006), he played Frank Lundy, who hunted a serial killer that had been killing for 30 years.
Lucille Lortel Award nominee 2010 for Outstanding Featured Actor for "A Lie of the Mind".
Outer Critic Circles Award winner in 1982 for Broadway debut for "Fox Fire".
Drama Desk Award nominee in 1991 for Best Actor in a Musical for "Will Rogers Follies".
Tony Award nominee in 1991 for Best Actor in a Musical for "Will Rogers Follies".
Keith and his Nashville (1975) co-star, Cristina Raines, were in a relationship during the 1970s. For a time, the couple shared a one-story home in Los Angeles' Topanga Canyon.
Carradine designated Victor Fleming's Captains Courageous (1937) as his favorite film for the AFI.