Janet Gunn graduated in 1980 from W.E. Boswell High School in Saginaw, Texas where she was active in school dramas and plays. She was also a varsity cheerleader and was elected Homecoming Queen her senior year. Standing at 5'3", she worked at a variety of jobs, including a car saleswoman, personal assistant, flight attendant with Southwest Airlines and as one of the Dallas Cowboy Cheerleaders for two seasons in the early 1980s. Her opening into acting began as Susan Howard's stunt double on the television series Dallas in 1988. Her first major starring role was that of Kelly Cochran in the CBS series Dark Justice in 1991. She is best known as Detective Cassandra St. John on the USA Network's Silk Stalkings from 1996-1999.