Beth Chapman, who starred alongside her husband in the reality show “Dog the Bounty Hunter” and a series of spinoffs that chronicled their lives in the world of bounty hunting, died on Wednesday at 51.

The cause was complications from cancer, according to a statement from WGN America, which was working on a new spinoff at the time of Ms. Chapman’s death.

Ms. Chapman and her husband, Duane Chapman, known as Dog, rose to prominence with the 2004 premiere of “Dog the Bounty Hunter,” which followed the couple’s unusual family business: tracking down and detaining people in Hawaii and Colorado who had violated the terms of their release from custody.

The show lasted for eight seasons and was followed by a three-season spinoff and a two-hour special on her battle with cancer, which kept Ms. Chapman and her family on TV and in the public eye for well over a decade.