The first episode, which debuted in May, was originally watched by 1.5 million viewers while the season finale was seen by 976,000 people, according to Nielsen Media Research.
Richards was divorced from Charlie Sheen in 2006; the two were embroiled in a bitter custody battle over their two young daughters, who often appeared in the first season of the reality show.
The 37-year-old actress has also starred in such films as "Starship Troopers," "Wild Things" and "The World Is Not Enough."
