Jim Beckett is Detective Kate Beckett's father and widower of Johanna Beckett, Kate's mother, who was murdered while Kate was in college, roughly ten years before Richard Castle and Kate meet. In A Chill Goes Through Her Veins (episode 1.5), Kate tells Castle how her Dad became an alcoholic after Johanna's murder went unsolved, but has achieved several years of sobriety. It is his watch that Kate wears on her wrist in remembrance of how she saved his life by getting him to sober up.
In Sucker Punch episode 2.13), he tells Kate how he couldn't sleep during her first year as a cop because he feared that the city would destroy her, but tells her not to be afraid of solving her mother's case.
He affectionately calls his daughter "Katie."
He is portrayed by actor Scott Paulin, and appears in a photo in A Chill Goes Through Her Veins, and in the flesh in Sucker Punch.