Jenny McCarthy?
JM claimed to have auditioned for this movie, and that Seagal ordered her to take off her dress in his office. She supposedly told him to watch her Playboy video then ran out crying. http://www.popeater.com/2010/04/15/steven-seagal-made-jenny-mccarthy-cry/
If this is true, what part could she possibily have played? Heigl is 6 years younger, so I doubt McCarthy was up for the role of Sarah Ryback. This would have been one of McCarthy's first movies, so maybe it was the busty woman who distracts the bad guys with her cleavage (probably the role of "Lady Hostage" that went to Ginger Lewis).
I'm not sure why McCarthy would have been auditioning for this movie in the first place.