11th Victim

11th Victim is a 1979 American madefortelevision crime drama directed by Jonathan Kaplan and starring Bess Armstrong and Max Gail.

Jill Kelso Bess Armstrong is a Des Moines, Iowa television news anchor, whose younger sister, an aspiring actress, has entered a life of prostitution in Los Angeles. When the sister becomes the eleventh victim of a sex murderer, Kelso conducts her own undercover investigation into Hollywoods night world of commercial sex. Along the way, chemistry develops with a sympathetic cop Max Gail who tries to save her from becoming a victim herself.

Source: Wikipedia