Female regular cast

I wouldn't call it a revolving door because there were only three total and the last one was still with the show when it ended.

I have no clue why Brianne Leary left. Hopefully she didn't "drop out" with her cousin Timothy Leary.

Randi Oakes was said to have left because she wanted to spend more time with Gregory Harrison. It makes sense because she quit acting all together a couple years later.
Whoever came after Randi doesn't matter because Larry Wilcox left and the show pretty well bombed afterwards.

Tina Gayle finished out the show and afik, quit acting soon after. Considering the bad ratings of the last season, she was probably more famous from being a Dallas Cowboy Cheerleader and being on Battle of the Network Stars.

There was one actress in this who should have been a regular. Her name is Tammy Alverson, and she looked like Jennifer Lawrence. The episode that Tammy was in is called Crash Course.